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You can read our previous article on why does email bounce, bounceback, or error? Since these are due to multiple reasons, the solutions can vary.
Below are the most common solutions to getting your email delivered successfully: Since this error can be caused by server issues it can be helpful to ask the person you are sending to if they are having any other related problems.
Summary: This article describes how you use Domain Keys Identified Mail (DKIM) with Office 365 to ensure that destination email systems trust messages sent outbound from your custom domain.
You should use DKIM in addition to SPF and DMARC to help prevent spoofers from sending messages that look like they are coming from your domain.
If you do not set up DKIM for your custom domain, Office 365 creates a private and public key pair, enables DKIM signing, and then configures the Office 365 default policy for your custom domain.
In the bounceback example above, the cause of the issue is that this user has Word Press setup to allow comments on posts.However that e-mail address doesn’t exist on the Remote mail server, so it’s always going to fail and cause a bounce-back error.Typically these types of bounceback errors are hard bounces, meaning that trying to send the message again won’t be successful.Your message did not reach some or all of the intended recipients. The receiving system is not allowing the message to proceed. Off the top of my head, here are some possible causes: Your domain (sending domain) could be black- or gray-listed The sending address (your user) could be black- or gray-listed Your sending IP address could be black- or gray-listed Something in the message matches a rule in content filtering The sending address doesn't match what is in your HELO or EHLO statement (if the receiving system checks) The domain in the sending address doesn't match the domain of the FQDN as defined by a reverse-lookup of the sending IP address (if the receiving system checks) You can narrow some of the options by looking for consistency of the NDRs.Subject: xxx Sent: 2/9/2008 AM The following recipient(s) cannot be reached: useremail address on 2/9/2008 AM There was a SMTP communication problem with the recipient's email server. Is it always the same users or does it seem random?