Comparison of webmail providers

The following tables compare general and technical information for a number of notable webmail providers who offer a web interface in English.

The list does not include web hosting providers who may offer email services as a part of hosting package.

General

General information on webmail providers and products

Product Released Cost Mailbox storage Attachment limit Supported languages Conversation threading POP3[lower-alpha 1] support IMAP support SMTP support JMAP support Cryptographic protocol support IPv6 support
AOL Mail 1993[1] Free (with ads) Unlimited[2] 25 MB[3] 54[4] No[5] Yes Yes Yes ? SSL No
Excite 1997
 Free (with ads) 1 GB ? ? ? ? ? ? ? Yes No
Fastmail 1999
 $30/year to $90/year[6] 2 GB to 100 GB
 50 MB[7] 37
 Yes[8] Yes Yes Yes Yes SSL, TLS[9] No
Gandi 2008
 Free (no ads); Multi-tiered pricing[10] 3 GB (free), 50 GB[10] 25 MB[11] 38[12] ? Yes[13] Yes[13] Yes[13] ? SSL, TLS[13] Yes
Gmail 2004
 Free (with ads); $6/user/month on the user's domain[14] free: 15 GB[15] (can purchase more);

paid: 30 GB

 25 MB[16]
(10 GB per file via Google Drive)[17]		 71
 Yes[18] Yes Yes Yes[lower-alpha 2] ? SSL, TLS Yes
GMX Mail
(gmx.net)		 1997
 Free (with ads)[20] or Paid (€3–5/month) 65 GB (free for gmx.com), 1.5 (for gmx.de/net)[21]
 20 MB (free)
50–100 MB (paid)
 German,English,French,Spanish
 ? Yes Yes Yes ? Yes No
HEY
 2020[22]
 Free 14-day trial
$99/year[23]		 100 GB[23] ? English
 ? No[24] No[24] ? No TLS[25] No
Hushmail 1999
 Free 14-day trial
$49.98 year (Premium)[26]		 10 GB (Premium)
 20 MB per file, total 50 MB per mail[27] English
 No[28] Paid Paid Paid ? SSL, TLS, OpenPGP No
iCloud[lower-alpha 3] 2011
 Free (no ads) or $0.99/month, $2.99/month, or $9.99/month[lower-alpha 4] 5 GB (Free), 50 GB, 200 GB, or 2 TB monthly[lower-alpha 5]
 20 MB

(5GB per message with Mail Drop via iCloud)[31]

 4
 Yes[32] No[33] Requires phone number for mandatory 2FA[34][35] Requires phone number for mandatory 2FA[34][35] ? SSL, TLS[33] No
Kolab Now 2013
 Free 30-day trial
From 4.41 CHF/month (individuals), 5.38 CHF/month (groups)[36]		 2 GB, can purchase more[37] ? English
 Yes[38] No Yes[39] Yes[39] ? SSL/TLS[39] No
Lycos 1997
 $4.95 per month
$19.95 yearly[40]		 5 GB
 35 MB
 English
 No Yes Yes Yes ? SSL/TLS No
Mail.com[lower-alpha 6] 1996
 Free (with ads) or $3.95/month or $19.95/year Unlimited
 30 MB
[41]		 3
 ? Paid Paid Paid ? SSL No
Mail.ru 1998[42] Free (with ads) or paid options Unlimited
 50 MB
 11
 ? Yes Yes Yes ? SSL, TLS No
Mailfence 2013[43][44] Free (no ads)
€2.5/month (Entry)
€7.5/month (Pro)
€25/month (Ultra)[45][46]		 500 MB (free)
5 GB (Entry) or 20 GB (Pro) or 50 GB (Ultra)[45]		 10 MB (Free)
50 (Entry/Pro/Ultra)
[47]		 7[48] Yes[49] Paid[50] Paid[50] Paid[50] ? SSL/TLS, OpenPGP[51] No
Outlook.com
(Live Mail, Hotmail)		 1996 (Hotmail)
2012 (Outlook)
 Free (with ads); Paid option 15 GB[52] 32 MB (Unlimited via OneDrive)
 106
 Yes[53] Yes[54] Yes[54] Yes[54] ? SSL,[54] Exchange ActiveSync[54] No
Posteo 2009
 €1/month to €1,45/month[55] 2 GB storage
(can be increased)		 50 MB 3 ? Yes Yes Yes ? Yes No
ProtonMail 2013
 Free (no ads); Multi-tiered pricing 500 MB (free)
5 to 20 GB[56]		 25 MB
 10
 Yes[57] No Paid[58] Paid[58] No SSL, TLS, Tor, OpenPGP No
Rackspace 2001[59] $2.99/user/month[60] 25 GB[61] 50 MB[61] 12[62] No Yes Yes Yes ? SSL, TLS No
Rediffmail 1997
 Free (with ads) and Paid: ₹399 (US$5.60)/year for POP3; ₹50 (70¢ US)/month for mobile Unlimited
 25 MB
 11
 ? ₹399 (US$5.60) ? ? ? SSL, TLS No
Runbox 2000[63] Minimum (micro plan): $19.95/year or €14.95/year[64] 1 GB (micro plan)[64] 100 MB (micro plan)[64] 2
 Yes[65] Yes Yes Yes No SSL No
Tutanota 2011
 Free (no ads)
€12 year (Premium)[66]		 1 GB Free and Premium, 10GB Teams. Can be upgraded to 10GB, 100GB, or 1TB.
[67]		 25 MB
[68]		 30
 No[69][70] No[71] No[71] No No SSL, DANE No
Yahoo! Mail 1997
 Free (with ads)
Yahoo! Mail Plus $49.99		 1 TB[lower-alpha 7] 25 MB
(150 MB per file via Dropbox)[73]		 27
 Yes[74] Most countries or YPOPs! Yes[lower-alpha 8] Yes ? SSL[76] No
Yandex Mail 2000
 Free (with ads) Unlimited[77] 22 MB per file, total 30 MB per mail (2 GB per file via Yandex Disk)[78] 10
 ? Yes[lower-alpha 9] Yes Yes ? SSL, TLS Yes
Zoho Mail 2008
 Personal Free (no ads); Premium options $24 to $99/user yearly 5 GB "Lite".
"Standard": 10 & 15 GB
 20MB free, 30 or 50 MB paid
 16
 Yes[79] Paid[80] Paid[80] Paid ? SSL No
Product Released Cost Mailbox storage Attachment limit Supported languages Conversation threading POP3[lower-alpha 1] support IMAP support SMTP support JMAP support Cryptographic protocol support IPv6 support
  1. Most mail services that do not support POP3 access can be accessed through the FreePOPs mail proxy software.
  2. Requires the user to enable a specific settings in Gmail account ("less secure apps") or, for 2FA-enabled accounts, to generate and use a separate "application password".[19]
  3. Must be an Apple (iPod, iPad, &c.) owner to obtain an account, but works on Windows, as well.
  4. 50 GB cost $0.99/month, 200 GB cost $2.99/month, or 2 TB cost $9.99/month[29][30]
  5. shared between file and email storage, customizable ratio
  6. Registration with an IP-address from Austria, Switzerland or Germany is not allowed.
  7. Yahoo! Mail announced gratis 1 TB of storage space for all its members, in October 2013.[72]
  8. Also can be used on non-mobile devices via third-party software.[75]
  9. But doesn't delete them off the server automatically, in contrast to standard POP3 operation. See https://yandex.com/support/mail/mail-clients.html#pop3

Digital rights
See also: Comparison of web search engines § Digital rights, PRISM (surveillance program), Internet privacy, and digital rights

Verification

Security information users must provide to verify and complete the registration when opening an account:

ProductSMS verificationSecondary email verificationProprietary captcha (ReCAPTCHA or other)
AOL Mail Yes Un­known Yes
Excite Yes Yes Yes
FastMail Yes Yes Yes
Gandi ? ? ?
Gmail Yes Optional Yes[81]
GMX Mail
(gmx.com)		 email or mobile phone[82] email or mobile phone[82] Yes
Hushmail Yes[83] Yes[83] Yes
iCloud Un­known Un­known Yes
Laposte.net Optional Optional Yes
Lycos Yes No Yes
Mail.com No Optional Yes
Mail.ru Yes Un­known Yes
Mailfence No Yes Yes
Outlook.com Yes Un­known Yes
ProtonMail email or mobile phone Optional secondary email Optional[84]
Rackspace No Yes Yes
Rediffmail Yes Yes Yes
Runbox No Yes Yes (ReCaptcha on registration[85])
Tutanota No No No[86]
Yahoo! Mail Yes Un­known Yes
Yandex Mail Yes[lower-alpha 1] Un­known Yes
Zoho Mail Yes Yes Yes

Secure delivery

Features to reduce the risk of third-party tracking and interception of the email content; measures to increase the deliverability of correct outbound messages.

Anti-interception Outbound anti-spoofing and deliverability Other[lower-alpha 2]
Product STARTTLS (outbound)[lower-alpha 3] STARTTLS (inbound)[lower-alpha 4] Tracking content prevention[87] Basic SPF[lower-alpha 5] SPF for custom domain and client[lower-alpha 6] Default DKIM[lower-alpha 7] DKIM for custom domain and client[lower-alpha 8]
Alice.it, Tin.it ? No[88]
AOL Mail No[88] ? ? ? ? ? ? ?
Comcast.net ? Yes[89]
FastMail ? ? ? Yes ? ? Yes[90] ?
Folha (bol.com.br, uol.com.br) ? No[88]
Gandi[91] ? ? ? ? ? Yes[92] No[93] ?
Gmail Yes Yes Yes[87] Yes ? Yes ? Adds ARC, does not enforce DMARC rejection for Gmail.[94] Does not respect permissive DKIM, SPF and DMARC settings for inbound email.[95]
GMX Mail
(gmx.com)		 ? ? ? Yes ? ? ? ?
Hushmail ? ? ? ? ? ? ? ?
iCloud[lower-alpha 9] ? Yes[89] ? ? ? ? ? ?
Laposte.net ? ? ? ? ? ? ? ?
Libero.it No Yes[89]
Lycos ? ? ? ? ? ? ? ?
Mail.com ? ? ? ? ? ? ? ?
Mail.ru ? Yes[89] ? ? ? ? ? ?
Mailfence No Yes [96] Yes [97][98] Yes [99] Yes [100] Yes Yes [100] ?
Outlook.com Yes[89] Yes[87] ? ? ? ? ? Adds ARC via Office 365 [101]
Orange.fr ? Yes[89]
OVH[102] ? ? ? Yes ? ? No[103] ?
ProtonMail ? ? ? Yes ? ? ? ?
Rackspace ? ? ? Yes ? ? ? ?
Rediffmail ? ? ? ? ? ? ? ?
Runbox ? ? ? Yes[104] Some anti-spoofing[105] ? Yes[106] ?
Tiscali No No[88]
T-online.hu ? No[88]
Tutanota ? ? ? Yes ? ? ? ?
Yahoo! Mail No (yahoo.co.jp)[88] No (yahoo.co.jp)[88] ? Yes ? ? No DMARC policies incompatible with most mailing lists.[107]
Yandex Mail ? ? ? Yes ? ? ? ?
Wp.pl (O2) ? Yes[89]
Zoho Mail ? ? ? ? ? ? ? ?

Other

Verified privacy and legal defense[lower-alpha 10] Verified (possibly) neutral technology Claimed privacy policies[lower-alpha 11]
Product Location Fully free software webmailSecure (TLS) webmailTor gateway availableTor browser allowed[lower-alpha 12]Proxy gateway availableInternet censorship (countries)HTTP tracking cookiesPersonalized ads[lower-alpha 13]Email tracking[lower-alpha 14]Information sharing
AOL Mail USA No Yes (default) No Yes Un­known Un­known Un­known Yes Yes Yes
FastMail Australia / USA Partial (Roundcube option)[lower-alpha 15] Yes (default) No Yes Yes[113] Un­known Un­known No Un­known Un­known
Gandi France Yes (Roundcube[114])
Gmail USA No (HTML option, requires proprietary JavaScript[115] for ReCAPTCHA)[116] Yes (default) No Requires Tor users to confirm their identity with SMS No Un­known Yes Yes Yes Yes
GMX Mail
(gmx.com)		 Germany No Yes No Yes Un­known Un­known Un­known Un­known No[117] Un­known
Hushmail Canada No Yes (default) No Yes (2012)[118] Un­known Un­known Un­known No Un­known No
iCloud[lower-alpha 16] USA No Yes (default) No Un­known Un­known Un­known Un­known Un­known Un­known Un­known
Laposte.net France No Yes No Unknown Unknown No Unknown Unknown Unknown Unknown
Lycos Korea No Yes No Un­known Un­known Un­known Un­known Un­known Un­known Un­known
Mail.com Germany / USA No Yes No Yes Un­known Un­known Un­known Un­known Un­known Un­known
Mail.ru Russia No[119] Yes (default) No Yes Un­known Un­known Un­known Un­known Un­known Un­known
Mailfence Belgium No Yes (default) No Yes[120] Yes[121][122] No No No No No
Outlook.com USA No Yes (default) No Requires Tor users to confirm their identity with SMS Un­known Un­known Un­known No[117] Limited[lower-alpha 17] Yes[123]
OVH France Roundcube option[124]
ProtonMail Switzerland Yes[125] Yes (default) Yes Yes No No No No No No (blocked in Russia)[126]
Rackspace USA No Yes (default) No Un­known Un­known Un­known Un­known No[127] No[127] No[127]
Rediffmail India No Yes No Yes Un­known Un­known Un­known Un­known Un­known Un­known
Runbox Norway Yes (Runbox 7, GPLv3;[128] Roundcube until 2019[129]) Yes (default) No Yes No No No No No No
Tutanota Germany Yes (F-Droid client and captcha also GPLv3[130]) Yes (default) No Yes No No No No No No (blocked in Russia)[126]
Yahoo! Mail USA No Yes (default) No Yes Un­known Un­known Un­known Yes Yes Yes
Yandex Mail Russia No Yes (default) No Yes Un­known Un­known Un­known Yes[117] Yes[117] Un­known
Zoho Mail USA / India No Yes No Un­known Un­known Un­known Un­known No Un­known Un­known
  1. Yandex mail accounts can be created anonymously. However after approximately 2 months of usage all of a sudden on login Yandex says that your account seems to be hacked (which is not true), and in order to improve security you are not permitted to log in unless you provide a phone number. Since the user after 2 months most probably has important unread emails on the account, he renounces his privacy and enters his phone number. Although this policy apparently is not applied retroactively to accounts created long time ago.
  2. Additional notes like usage of DMARC, ARC
  3. Ability to use STARTTLS over SMTP
  4. Verified with https://starttls-everywhere.org/ or other
  5. SPF is configured and outbound mail passes SPF test from default webmail and SMTP
  6. SPF can be configured on a custom domain with reserved IP address or shared addresses and anti-spoofing measures
  7. Outbound mail has a default DKIM signature by default
  8. A custom DKIM signature can be generated for outbound mail and configured on a custom server
  9. Must be an Apple (iPod, iPad, &c.) owner to obtain an account, but works on Windows, as well.
  10. This information can be verified by anyone with access to internet. Servers location play role in a investigation and serves thereof for legal defense
  11. Statement cannot be verified to be actual true as the information is handled by servers not accessed by the public
  12. It is possible that users cannot log in if they don't enable cookies or JavaScript for the Tor browser.
  13. For services hosted by companies that also own web search engines: The results of ads are arranged for the user in accordance to his/her interests as determined from previous search queries or other information available to the search engine.
  14. Tracking the user is not necessarily bad faith behaviour – it has to be conducted in order to provide personalized search results.
  15. Some parts of the FastMail web software have been released as free, open-source software. The front-end JavaScript library is released as Overture JS[108][109] and the rich-text editor as Squire.[110][111] The data model and various client code was donated to Roundcube for its JMAP implementation.[112]
  16. Must be an Apple (iPod, iPad, &c.) owner to obtain an account, but works on Windows, as well.
  17. Only for security threats.

Unique features
Unique features in webmail products
Name Features
FastMail One time passwords;[131] spam filter; backscatter detection;[132] deletion of selected attachments. Android and IPhone apps.
Gmail Account verification via SMS or voice call in some countries;[133] "Normal" view via Settings; Labels instead of folders; Undo send (implemented as a delayed send)
Laposte.net spam filter, deletion of selected attachments, address book and calendar/agenda, import/export features for mails, contacts and calendar events, custom signatures for each alias, filters (custom rules) for organizing your emails, holiday mode (auto-response), mobile app for smartphones, integration with Digiposte (a virtual safe-deposit box that allows you to safely archive all your documents in a secured place, including legal documents).
Mailfence Client-side encryption with email expiration, Digital signatures, Full OpenPGP inter-operability and support, Integrated account keystore, Multiple PGP keypair support, Public keyserver connection, Full reversibility and key revocation,[134] Full email-suite, Shared mailbox and collaboration with group members
Outlook.com One-time password, Mobile alerts, Account verification via SMS or voice call in some countries, Rules,[135] Scheduled Cleanup,[135] Filter to e.g. only see newsletters or Emails from contacts,[135] Recover deleted emails;[136] Key encryption for paid accounts[137]
ProtonMail Client-side encryption, email expiration, automatic encryption for ProtonMail-ProtonMail emails, optional email encryption for messages from ProtonMail to other providers
Rackspace White label option for resellers; Webmail chat; Recover deleted emails; Shared contacts and calendars; SMS based password recovery; Integrated Cloud Drive file storage with document and spreadsheet editors; Attach files from Dropbox[61]
Rediffmail sign-in via Google, Yahoo!, Facebook, Twitter, Mobile Sync; Indrive.
Tutanota Client-side encryption, automatic encryption of mailbox, automatic encryption of emails between Tutanota users, optional email encryption for messages from Tutanota to other providers
Yandex Mail No ads, email for own domains (Yandex PDD), scheduled email delivery, SMS verification, sign-in via Twitter, VK, Facebook, Google Profile
Zoho Mail Email Sharing, Folder Sharing, Collaborating with other users by Chat/ Social media for organization, Filters, Schedule and send emails, reminders, Notes, Tasks, Bookmarks and so on.

Features
Service Name Automatic forwarding Email client access[lower-alpha 1] Client email for other server Integration with IM service Domain
Name
customization		 Interface
script
technique		 Virus scanning Filters out emails with executable attachments Custom "From:" Address Address modifiers (subaddressing) Server hosted public keyring (for encryption) Shared key encryption
AOL Mail No Yes
(POP3, IMAP, SMTP)		 Yes[lower-alpha 2] AOL Instant Messenger No[lower-alpha 3] JavaScript/ Ajax Yes
(McAfee)		 No Yes ? No No
FastMail Yes Yes
(POP3, IMAP, SMTP)		 Yes
(POP3 only)		 No (XMPP until 2016-01-31[138]) Some paid plans only HTML/ JavaScript/ CSS/Ajax Yes Configurable with user filtering rules Yes Plus addressing and subdomain addressing[139] No No
Gmail Yes Yes
(POP3, IMAP)
SSL/TLS supported
SMTP restricted[lower-alpha 4]		 Yes
(POP3 only)		 Google Talkbeta (XMPP), AOL Instant Messenger Via G Suite, premium plans only HTML/ JavaScript/ Ajax[lower-alpha 5] Yes Yes, including .exe files in zip files Yes, limited.
Feature restricted to preconfigured addresses. Addresses not registered in advance with Gmail are blocked.		 Plus addressing No No
Hushmail Business accounts only Extra cost[lower-alpha 6] ? No Business accounts only HTML/ JavaScript/ Ajax Yes ? Yes, unlimited email aliases for paid subscribers No Yes Yes
Laposte.net No Yes (POP3, IMAP, SMTP) SSL/TLS supported Yes (POP3, IMAP)

SSL/TLS supported

 No No user can choose between HTML or Ajax Yes ? Yes (max. 6 alias per email account) No No No
Mail.com Premium accounts only Yes
(POP3, IMAP, SMTP)
SSL/TLS supported		 Yes
(POP3 only)		 Google Talk (XMPP) No HTML/ JavaScript/ Ajax2 Yes Yes, including .exe files in zip files Yes No No No
Mail.ru Yes Yes
(POP3, IMAP)		 Yes
(POP3, IMAP)		 ICQ, Custom Yes (Free, Mail.ru for Business supports up to 5000 mailboxes) HTML/ Ajax (Beta) Yes
(Kaspersky)		 ? Yes ? No No
Mailfence Paying accounts only Paying accounts only
(SMTP, POP3, IMAP, Exchange ActiveSync), DAVx supported		 Yes XMPP[lower-alpha 7] Paying accounts only HTML/ Ajax Yes Yes, including .exe files in zip files Paying accounts only Plus addressing[140] Yes Yes[141]
Outlook.com Yes Yes
(POP3, SMTP, IMAP,[142] Microsoft Exchange Server)		 Yes
(POP3 only)		 Skype, Google Hangouts, Facebook Chat Via Office 365, some premium plans only HTML/ JavaScript/ CSS/Ajax Yes Yes, including .exe files in zip files Yes Plus addressing[143] Via Office 365 Via Office 365
ProtonMail No Premium plans only through ProtonMail Bridge[144] No No Premium plans only JavaScript/Ajax Yes (ClamAV) No Yes Plus addressing Yes Yes
Rackspace Yes Yes
(POP3, IMAP, SMTP)
SSL/TLS supported		 ? Custom Yes HTML/ JavaScript/ CSS/Ajax Yes Yes, including .exe files in zip files Yes Plus addressing No No
rediff No Premium plans only ? Rediff Bol Yes JavaScript/ Ajax2 Yes ? Yes ? No No
Runbox Yes Yes
(IMAP, POP, SMTP)
SSL/TLS supported		 Yes
(POP3, Hotmail, Gmail)
SSL/TLS supported		 No Paid plans only HTML/ JavaScript/ CSS/Ajax/ Canvas (Beta) Yes
(ClamAV)		 If discarded by virus scanner Yes
Selectable while composing; saved identities		 Plus addressing[145] No No
Seznam.cz Yes Yes
(POP3, IMAP, SMTP)
SSL/TLS supported		 Yes
(POP3 only)		 No No HTML/ JavaScript Yes
(ESET-NOD32)		 ? Yes ? No No
Tutanota No No ? No Premium plans only JavaScript No No Yes No Yes Yes
Yahoo! Mail Premium plan only[lower-alpha 8] POP3-Plus members only, but free in some countries, IMAP
SSL/TLS supported		 Yes
(POP3 only)		 Yahoo! Messenger Premium plan only HTML/ JavaScript/ CSS/Ajax Yes
(Norton AntiVirus)		 Yes, including .exe files in zip files Yes
& only 10 addresses		 Plus addressing (using "-" only) No No
Yandex Mail Yes Yes (POP3, IMAP, SMTP, SSL) Yes
(POP3 only)		 Ya Online, any XMPP IM Yes (Free, Yandex PDD supports up to 1000 mailboxes without verification of legal use) HTML/ JavaScript/ CSS/Ajax Yes
(Dr.Web[147])		 Configurable or/and if discarded by antivirus Yes, only from confirmed addresses[148] Plus addressing[149] No No
Zoho Mail Yes if you use Zoho domain, if you use your own domain then Premium plans only[150] Premium plans only (POP, IMAP, SMTP) Yes (POP) XMPP, Google Talk, AOL Instant Messenger, ICQ, Yahoo! Messenger Business plans only, including free plan Ajax Yes ? Yes ? No No
Service name Automatic forwarding Email client access[lower-alpha 1] Client email for other server Integration with IM service Domain
Name
customization		 Interface
script
technique		 Virus scanning Filters out emails with executable attachments Custom "From:" Address Address modifiers Server hosted public keyring (for encryption) Shared key encryption
  1. Most mail services that do not support POP3 access can be accessed through the FreePOPs mail proxy software.
  2. Through AOL Easy Transfer
  3. Through AOL My eAddress
  4. Gmail restricts the FROM field to registered addresses. e.g. Disposable addresses forbidden.
  5. HTML interface available for legacy browsers or users with JavaScript disabled.
  6. IMAP access available for $14.99 for the first year and $29.99 yearly thereafter.
  7. Mailfence provides an internal Instant Messaging feature for group members.
  8. Yahoo! Mail had automatic forwarding available to all accounts prior to January 15, 2021.[146]

See also

References
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  2. Wenzel, Elsa. "AOL Mail offering unlimited storage, integrated chatting". CNET. Retrieved November 8, 2020.
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  4. "How Do I Change the Language on Aol?". gethuman.com. Retrieved November 8, 2020.
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  11. "Technical Limitations of Gandi Email".
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  40. "End of free service FAQ : Lycos". lycos.freshdesk.com. Retrieved December 10, 2018.
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  44. Claudio R. (February 27, 2019). "Mailfence Review – Secure & Private Email Service". anonymster.com. Retrieved February 27, 2019.
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  46. "Mailfence announces Ultra storage plan".
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  48. "The Mailfence translation project". blog.mailfence.com. Retrieved June 15, 2018.
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  54. "Compare Outlook.com". Microsoft.
  55. "Posteo conditions".
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