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  2. SendGrid - Wikipedia

    en.wikipedia.org/wiki/SendGrid

    In the same month, SendGrid announced a partnership with web host service Rackspace Hosting that allows Rackspace users to launch email campaigns using SendGrid's software. [7] [24] [26] By January 2012, the service reported sending out 2.6 billion personalized emails monthly. [12] [42] [43] By March, the company was experiencing 10% monthly ...

  3. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative ...

  4. Simple Mail Transfer Protocol - Wikipedia

    en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol

    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 ...

  5. Use POP or IMAP to sync AOL Mail on a third-party app or ...

    help.aol.com/articles/how-do-i-use-other-email...

    Most email software and applications have an account settings menu where you'll need to update the IMAP or POP3 settings. When entering your account info, make sure you use your full email address, including @aol.com, and that the SSL encryption is enabled for incoming and outgoing mail.

  6. Message transfer agent - Wikipedia

    en.wikipedia.org/wiki/Message_transfer_agent

    Submission of new email from a mail client is via SMTP, typically on port 587 or 465, and is now generally restricted to servers the user has an account with-such as their ISP. This is for policy, not technical, reasons so that providers have some means of holding their users accountable for the generation of spam and other forms of email abuse.

  7. SMTP Authentication - Wikipedia

    en.wikipedia.org/wiki/SMTP_Authentication

    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.

  8. AOL Mail limits on sending bulk mail - AOL Help

    help.aol.com/articles/aol-mail-limits-on-sending...

    In order to better enforce anti-spam policies, AOL does not disclose the number of recipients or emails that can be sent at one time. If you've received a notification that a limit has been met, you'll need to wait a set amount of time before you can send more emails. Most sending limit notifications inform you of how long you'll have to wait.

  9. Smart host - Wikipedia

    en.wikipedia.org/wiki/Smart_host

    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.