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535 5.7.8 Authentication credentials invalid [3] 538 5.7.11 Encryption required for requested authentication mechanism [3] 550 Requested action not taken: mailbox unavailable (e.g., mailbox not found, no access, or command rejected for policy reasons) 551 User not local; please try <forward-path> 552 Requested mail action aborted: exceeded ...
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.
Find out more about why your messages to AOL members keep getting rejected.
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.
p (required), public key data (base64 encoded, or empty if the public key has been revoked) s (optional), service type (default * , else email ) t (optional), toggle flags (colon-separated list, default none, may include y for testing DKIM without rejecting failed signature verifications, and/or s which is recommended for subdomain strictness ...
Callback verification, also known as callout verification or Sender Address Verification, is a technique used by SMTP software in order to validate e-mail addresses.The most common target of verification is the sender address from the message envelope (the address specified during the SMTP dialogue as "MAIL FROM").
When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you.
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.