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  2. List of SMTP server return codes - Wikipedia

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

    A server capable of replying with an Enhanced Status Code MUST preface (prepend) the Text Part of SMTP Server responses with the Enhanced Status Code followed by one or more spaces. For example, the "221 Bye" reply (after QUIT command) MUST be sent as "221 2.0.0 Bye" instead. [1]

  3. Fix problems sending AOL Mail

    help.aol.com/articles/aol-mail-troubleshooting

    If you see an image challenge question when sending mail, you should just be able to complete the challenge then send mail. If, however, you correctly answer the image challenge and still can't send mail, it could be a sign of a more serious issue with your account, which may require additional steps to secure your account.

  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. Reauthenticate your AOL Mail account in third-party email ...

    help.aol.com/articles/reauthenticate-your-aol...

    Click the Email Accounts button. Look for the email account you want to update and double-click on it. Remove and re-enter your AOL Mail password. (Note: If you use an app password for Outlook, you may need to create a new app password. See the info below.) Check the status. When it says "Completed," click Close.

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

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

    Outlook 2010 – Follow steps under "Other Email Accounts." Outlook 2007 – Follow steps under "Other Email Accounts." Outlook for Mac – Follow steps under "Update your email settings in Outlook for Mac." Windows 10 Mail – Follow steps for "Add an account using advanced setup." Windows Live Mail – Follow steps "To change server settings ...

  7. Sender Policy Framework - Wikipedia

    en.wikipedia.org/wiki/Sender_Policy_Framework

    Sender Policy Framework (SPF) is an email authentication method that ensures the sending mail server is authorized to originate mail from the email sender's domain. [1] [2] This authentication only applies to the email sender listed in the "envelope from" field during the initial SMTP connection. If the email is bounced, a message is sent to ...

  8. Fix problems with third-party mail applications - AOL Help

    help.aol.com/articles/why-cant-i-access-my-aol...

    If you recently changed your AOL password, you'll need to update it in the email client you use. Find your application's "Email Accounts" or "Account Settings" section, select your AOL Mail account, then update to your new password. If you've activated 2-step verification for your AOL account, you'll need to generate and use an "app password ...

  9. 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.

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