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  2. List of SMTP server return codes - Wikipedia

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

    C: This is a test message with 5 header fields and 4 lines in the message body. C: Your friend, C: Bob C: . S: 250 Ok: queued as 12345 C: QUIT S: 221 Bye {The server closes the connection} And below is an example of an SMTP connection in which the SMTP Server supports the Enhanced Status Code, taken from RFC 2034:

  3. Why can't I send mail to AOL Mail users? - AOL Help

    help.aol.com/articles/aol-mail-addresses-are-not...

    If you're repeatedly getting delivery failure errors when sending messages to AOL Mail customers, it is most likely due to spam blocking on AOL's servers. While you may be following at the rules for sending mail, it's likely the address you're sending mail from is hosted on a server our system had identified as "abusive".

  4. Why did I receive an email from MAILER-DAEMON? - AOL Help

    help.aol.com/articles/what-is-a-mailer-daemon...

    The most common reason for a failed delivery is that the email address entered isn't valid. If the delivery failure message says the account doesn't exist double check the spelling of the address you entered. A single misplaced letter could cause a delivery failure.

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

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

    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" to access AOL Mail from these apps.

  6. phpList - Wikipedia

    en.wikipedia.org/wiki/PhpList

    Unlike discussion lists, phpList allows one to send messages to some of the subscribers in a list, based on complex criteria determined by the administrator. This software is useful for anyone who wants to manage a database that is more than just a collection of emails. phpList allows targeted sending with the use of sometimes very complex ...

  7. 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.

  8. Fix problems signing in to AOL Mail

    help.aol.com/articles/fix-problems-signing-in-to...

    While most sign in problems can stem from password issues, you might also get blank or missing screens, or various errors when trying to sign in. No matter the problem you're experiencing, the following troubleshooting steps should help you get back in your AOL Mail quickly. Sign in again

  9. Transport Layer Security - Wikipedia

    en.wikipedia.org/wiki/Transport_Layer_Security

    Add every virtual host name in the subjectAltName extension. The major problem being that the certificate needs to be reissued whenever a new virtual server is added. To provide the server name, RFC 4366 Transport Layer Security (TLS) Extensions allow clients to include a Server Name Indication extension (SNI) in the extended ClientHello ...