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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.

An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided. 497 HTTP Request Sent to HTTPS Port. An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests. 499 Client Closed Request.

If your Mail settings don't have Rich Text or HTML enabled, you could have problems with viewing images in forwarded emails. These settings can be enabled from the Mail Settings page. Send image as an attachment: If you've sent an image in an email, but your recipient didn't receive it there may have been a problem with the way the file was sent.

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". To restore your ...

Visit the online learning community for classes ranging from cooking, wellness and travel, to tech, arts, finance and more. AOL questions? Get 24x7 live expert help with all of your AOL needs from email and passwords, technical questions, mobile email and more. Upgrade your account by calling 1-800-358-4860.

Emails from specific senders may be set up to go to the trash or other folders. Check your settings to view or change where they're going. • If you've set up filters, the settings may be routing some emails to the trash. You can review your filter settings in New AOL Mail and edit or delete any incorrect filters. • If you're using a mobile ...