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  2. List of SMTP server return codes - Wikipedia

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

    4.XXX.XXX Persistent Transient Failure: Message as sent is valid, but persistence of some temporary conditions has caused abandonment or delay. 5.XXX.XXX Permanent Failure: Not likely to be resolved by resending the message in current form. In general the class identifier MUST match the first digit of the Basic Status Code to which it applies. [1]

  3. Fix sending and receiving issues with third-party email apps

    help.aol.com/articles/cant-send-or-receive-email...

    1. Sign into AOL Mail on a web browser. 2. Compose an email and add your own email address in the "To" field. 3. Send the email and check if it arrives.

  4. Fix problems sending AOL Mail

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

    If your contacts are getting emails you didn't send, your sent folder is full of messages you didn't send, or you're missing folders, it could be a sign that your account has been compromised or hacked. If you notice these signs, you may also end up having problems with sending or composing mail.

  5. 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".

  6. List of FTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_FTP_server_return...

    A rule of thumb in determining if a reply fits into the 4xx or the 5xx (Permanent Negative) category is that replies are 4xx if the commands can be repeated without any change in command form or in properties of the User or Server (e.g., the command is spelled the same with the same arguments used; the user does not change his file access or ...

  7. Simple Mail Transfer Protocol - Wikipedia

    en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol

    A message can be doubled if there is a communication failure at this time, e.g. due to a power outage: Until the sender has received that 250 Ok reply, it must assume the message was not delivered. On the other hand, after the receiver has decided to accept the message, it must assume the message has been delivered to it.

  8. Outlook Has a Reply for the New Gmail, and It Looks Like This

    www.aol.com/news/apos-microsoft-apos-answer...

    Google may have just given Gmail a full-scale upgrade, but Microsoft is on its tail, at least for business users. The company is rolling out major upgrades to Outlook for Windows 10 on desktops ...

  9. Turn on or off vacation response in New AOL Mail

    help.aol.com/articles/turn-on-or-off-vacation...

    5. Enter your response message. 6. Click Save. Turn on another response for specific domains. 1. Toggle on or off Add another response. 2. Enter up to 2 domains (like aol.com or yahoo.com). 3. Enter a different message in the box. 4. Click Save.