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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

Gmail ignores all dots in the local-part of a @gmail.com address for the purposes of determining account identity. Subaddressing. Some mail services support a tag included in the local-part, such that the address is an alias to a prefix of the local part.

DomainKeys Identified Mail (DKIM) is an email authentication method designed to detect forged sender addresses in email (email spoofing), a technique often used in phishing and email spam.

When genuine news or a genuine important order or warning is issued on April Fools' Day, there is risk that it will be misinterpreted as a joke and ignored – for example, when Google, known to play elaborate April Fools' Day hoaxes, announced the launch of Gmail with 1-gigabyte inboxes in 2004, an era when competing webmail services offered 4 ...

Multi-factor authentication (MFA; encompassing two-factor authentication, or 2FA, along with similar terms) is an electronic authentication method in which a user is granted access to a website or application only after successfully presenting two or more pieces of evidence (or factors) to an authentication mechanism: knowledge (something only the user knows), possession (something only the ...

It allows the addition of up to 10 add-on addresses at different GMX domains. Its "mail collector" allows for the collection of email from most free email providers including Yahoo, Live, Hotmail and GMail as well as send mail from these addresses, allowing the management of multiple accounts from one single location.