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

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

    This often means your email address has been blocked from sending mail to a specific contact because your address has been blocked by privacy or spam control settings set by the owner of that account. Should this happen, you'll need to check with that contact to make sure you haven't been accidentally added to their blocked or spam list.

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

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

    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". To restore your ability to email AOL members, ask the administrator of your email domain to submit a request to the AOL Postmaster support team. The process to review these ...

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

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

    If your account is working on a web browser and you made sure you're using the right server settings, then update your email app to the newest version available. If you're still experiencing issues with your app, contact the manufacturer. Also, access your AOL Mail on a web browser. Keep in mind - For two-step verification, generate an app ...

  5. Email authentication - Wikipedia

    en.wikipedia.org/wiki/Email_authentication

    In the early 1980s, when Simple Mail Transfer Protocol (SMTP) was designed, it provided for no real verification of sending user or system. This was not a problem while email systems were run by trusted corporations and universities, but since the commercialization of the Internet in the early 1990s, spam, phishing, and other crimes have been found to increasingly involve email.

  6. HTTP 403 - Wikipedia

    en.wikipedia.org/wiki/HTTP_403

    If the user's IP address is not included in the list of permitted addresses, a 403 status code is returned. Server configuration: The server's configuration can be set to prohibit access to certain files, directories, or areas of the website. This can be due to a misconfiguration or intentional restrictions imposed by the server administrator.

  7. DMARC - Wikipedia

    en.wikipedia.org/wiki/DMARC

    SPF checks that the IP address of the sending server is authorized by the owner of the domain that appears in the SMTP MAIL FROM command. (The email address in MAIL FROM is also called the bounce address, envelope-from or RFC5321.MailFrom.) In addition to requiring that the SPF check passes, DMARC checks that RFC5321.MailFrom aligns with 5322 ...

  8. Recognize a hacked AOL Mail account

    help.aol.com/articles/recognize-a-hacked-aol...

    Your Address Book contacts have been erased or there are new contacts you didn't add. Review your AOL Mail settings. Hackers may change the settings in your AOL Mail account to disrupt your inbox or get copies of your emails. Access your mail settings and make sure none of your info or preferences were changed without your knowledge. Things ...

  9. DomainKeys Identified Mail - Wikipedia

    en.wikipedia.org/wiki/DomainKeys_Identified_Mail

    A receiving SMTP server wanting to verify uses the domain name and the selector to perform a DNS lookup. [8] For example, given the example signature above: the d tag gives the author domain to be verified against, example.net ; the s tag the selector, brisbane. The string _domainkey is a fixed part of the specification.