You should try again sending smaller sets of emails instead of one big mail-out. Invalid recipient address The recipient address is invalid. What does these numbers mean? There should be an error or a misspelling somewhere. Again, the typical cause is a message overload. The server will retry to mail the message again, after some time. Unfortunately, different servers sometimes use these codes in a different way, making the whole thing even more complicated… Anyhow, the most critical series of error messages is the 5xx one, and especially the ones from to You must check the bounceback e-mail for the error code, as well as the message immediately following. You should contact the recipient otherwise and get the right address. This error may depend on too many messages sent to a particular domain. Check whether the address is correct.
Reduce the number of recipients. Check whether the address is correct. It comes with more information about the server. Ask the recipient to check the resolution MX record of the domain name. You should contact your ISP and ask them to allow you as a certified sender. It may be caused by a bad interaction of the server with your firewall or antivirus. Read carefully their instructions to solve it. Contact your SMTP service provider to fix the situation. It contains information about your particular server, normally pointing to a FAQ page. The incoming server thinks that your email is spam, or your IP has been blacklisted. Usually the next try will succeed: The oppsite of an error: You must check the bounceback e-mail for the error code, as well as the message immediately following. Anyway, verify that is working on a reliable IP address. It is also known as a non-delivery report, failed delivery status notification, failed delivery message, or a number of other names, or even simply as a "bounce. Your message has been detected and labeled as spam. Best is to contact contact the user via another channel to alert him and ask to create some free room in his mailbox. This is typically because the resolution MX record of the recipient domain name does not exist. You should try again sending smaller sets of emails instead of one big mail-out. Re-send your message splitting the list in smaller subsets. Abnormal email sender account status Main account unavailable The current account is restricted or in an abnormal status. There should be an error or a misspelling somewhere. Ask your SMTP provider to verify what has happened. Try to send it again segmenting the list in different parts. Log on to the DirectMail console to view the current account status. If an authentication is needed, you should enter your username and password.
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