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This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative ...
If your third-party email app is having issues connecting, sending, or receiving emails, you may need to reconfigure your account or update the app. Use these steps to identify and fix the source of the problem.
When emails go missing in AOL Mail, it's often due to a few simple things; either the message is in the wrong folder, your third-party mail client's settings, or your account was deactivated due to inactivity.
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.
451 Unavailable For Legal Reasons (RFC 7725) A server operator has received a legal demand to deny access to a resource or to a set of resources that includes the requested resource. [25] The code 451 was chosen as a reference to the novel Fahrenheit 451 (see the Acknowledgements in the RFC).
The number 451 is a reference to Ray Bradbury's 1953 dystopian novel Fahrenheit 451, in which books are outlawed. [2] 451 provides more information than HTTP 403, which is often used for the same purpose. [3] This status code is currently a proposed standard in RFC 7725 but is not yet formally a part of HTTP, as of RFC 9110.
Windows 10 Mail – Follow steps for "Add an account using advanced setup." Windows Live Mail – Follow steps "To change server settings for your email service provider." IncrediMail – Follow steps "How do I reconfigure my email account?" iPhone Mail app – Follow steps to "Set up your email account manually."
Although the SMTP is a mature technology, counting more than thirty years, its architecture is increasingly strained by both normal and unsolicited load. [2] The email systems have been enhanced with reputation systems tied to the actual sender of the email, with the idea of recipient's email servers rejecting the email when a forged sender is used in the protocol.