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The initiating host, the SMTP client, can be either an end-user's email client, functionally identified as a mail user agent (MUA), or a relay server's mail transfer agent (MTA), that is an SMTP server acting as an SMTP client, in the relevant session, in order to relay mail. Fully capable SMTP servers maintain queues of messages for retrying ...
Proton Mail [a] is a Swiss [7] end-to-end encrypted email service co-founded in 2013 by Andy Yen. [8] [9] Proton Mail uses client-side encryption to protect email content and user data before they are sent to Proton Mail servers, unlike other common email providers such as Gmail and Outlook.com.
2 SMTP. 3 POP/IMAP. 4 JMAP. 5 Mail filtering. 6 Mail server packages. 7 See also. 8 References. Toggle References subsection. 8.1 Notes. Toggle the table of contents.
SMTPS (Simple Mail Transfer Protocol Secure) is a method for securing the SMTP using transport layer security. It is intended to provide authentication of the communication partners, as well as data integrity and confidentiality. SMTPS is neither a proprietary protocol nor an extension of SMTP.
SMTP Authentication, often abbreviated SMTP AUTH, is an extension of the Simple Mail Transfer Protocol (SMTP) whereby a client may log in using any authentication mechanism supported by the server. It is mainly used by submission servers, where authentication is mandatory.
A message submission agent (MSA), or mail submission agent, is a computer program or software agent that receives electronic mail messages from a mail user agent (MUA) and cooperates with a mail transfer agent (MTA) for delivery of the mail.
Proton Mail was released as a public beta on 16 May 2014 [11] as an end-to-end encrypted email service after a year of crowdfunding.Proton Mail 2.0 was released 14 August 2015, with open source front-end clients and a rewritten codebase.
A smart host or smarthost is an email server via which third parties can send emails and have them forwarded on to the email recipients' email servers. [1]Smarthosts were originally open mail relays, [1] but most providers now require authentication from the sender, to verify that the sender is authorised [1] – for example, an ISP might run a smarthost for their paying customers only.