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Email Error 550 5.1.1

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Use the Down Arrow and Up Arrow keys to select the recipient, and then press the Delete key. Please try again later. All Rights Reserved. to Exchange servers, will end up seeing this error in the bounce message: 550 5.1.1 User unknown (in reply to RCPT TO command) Read: How to fix error “550-Please turn on SMTP

Please check your recipient list and try again later. 554 This IP has been blocked for the day, for attempting to mail too many invalid recipients. Mail flow problems can be frustrating, but we have solutions you can try in order to get your message sent. Sorry, I don't mean to be awkward, but I don't think they'd be too happy with me posting any of their info publicly, and I'd rather not expose my company to

If we’re talking thousands of emails, you have to automate the process somehow. For more information What are Exchange NDRs in Exchange Online and Office 365 Share Was this information helpful? Bobcares provides Outsourced Hosting Support and Outsourced Server Management for online businesses. If the recipient's email address in the NDR is in the format IMCEAEX-_O=@, it's likely that they are replying to an old email message.

Will have to wait a couple of days before we know, I guess. till, Nov 17, 2008 #8 SimonH New Member yes, exactly, as far as I can remember. September 28, 2016 CategoriesCloud Computing Virtualization Web Hosting Data Center Management Software Development Security Support Desk Management Server Management DevOps CoreOS Docker LXC OnApp oVirt cPanel Plesk WordPress Magento Django Percona https://www.massmailsoftware.com/smtp/550-5-1-1.php Return to top Permanent Problems The most common permanent user problem is, of course, User Unknown.

Since then emails from my company to any email address at their company bounce back from the System Administrator with this error: Your message did not reach some or all of The following are all examples of User Unknown messages: : host host.example.com said: 550 ... There is another Domain Not Found error: "Sender Address Rejected: Domain Not Found"; for more information, please see Domain Not Found: Anti-Spam error below. ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: Connection to failed.

falko, Nov 18, 2008 #10 SimonH New Member apollo:~# cat /etc/postfix/main.cf # See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific: Specifying a file name will cause the first http://answers.microsoft.com/en-us/windows/forum/windows_vista-networking/error-550-511/8842d04d-85ee-4f99-8f40-59561ee6d7df Check your Sent folder for any messages that you know you didn’t send. Please try the request again. For the most part, mail works flawlessly, and we don't have any problems, but occaisionally, we find that some people just cannot email users on our server, no matter how hard

If you feel this message has been flagged as spam erroneously, please be sure to obtain a copy of the original message attempting to be sent, and then contact support. http://csimonitoring.com/email-error/email-error-553-5-3-0.php For more information, see Create DNS records at any DNS hosting provider for Office 365 and Customize an SPF record to validate outbound email sent from your domain.. How can we improve it? SimonH, Nov 17, 2008 #5 till Super Moderator Staff Member ISPConfig Developer Please enable the maildir checkbox under management > server > settings till, Nov 17, 2008 #6 SimonH New

However, there are things that are likely to be true, and we are going to talk about them. This same issue also occurs for domains where the only MX record is the ISPConfig server. **Edit** The DNS server IP is NOT the ip of the ISPConfig server, by the I have just changed the record back to the original IP, just in case that has anything to do with it. his comment is here I’m not going to try again; this message has been in the queue too long.

Check if there’s a current service issue in Office 365 affecting the user's account. Sign Up: Related posts: How to fix ‘550 5.1.1 : Recipient address rejected' error in Exchange and Postfix servers The curious case of Google tagging all mails as spam How to Send No thanks Thank you for your feedback! × English (United States)‎ Contact Us Privacy & Cookies Terms of use & sale Trademarks Accessibility Legal © 2016 Microsoft current community blog

In the To field, start typing the recipient's name or email address until the recipient appears in the drop-down list.

Last edited: Nov 17, 2008 _X_, Nov 17, 2008 #4 SimonH New Member Well, the account in question is one of a few that the sender tried for this domain. Wrong recipient address Sender would get the bounce message ‘550 5.1.1 User unknown‘, if the recipient mail server is unable to find the recipient mail account in it. It might also be a problem with the recipient’s domain configuration. If the DNS isn't valid, it must be fixed before you resend the email. 550 [email protected] Invalid SPF record.

There are two other anti-spam error messages that are very, very similar to some of the domain errors shown above. More... C3: To determine and confirm ownership of the IP address, you can do an IP address look up through DNS Stuff, senderbase.org or any other look-up tool. 554 This IP has http://csimonitoring.com/email-error/email-error-554-5-7-1.php If there’s a problem with the recipient’s domain, contact the recipient or the recipient’s email administrator to let them know about the problem.

If you don’t see any suspicious messages, it’s likely that the NDR you received is backscatter.