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Smtp Error 550 5.1.1

I'll check with their admin on point 1. Yes No Great! When you do, you receive a "550 5.1.1 User unknown" error . A certain number of these “bounce” emails signals email hosting providers about the possibility that the client is sending spam to unverified email addresses. http://whistlemedia.net/smtp-error/smtp-smtp-error-code-451.html

Solution 4: Make sure your email account wasn't compromised    Did you send the original message at all? If we assume that you are indeed an email marketer or just a person who has to send large quantities of emails on regular basis, you simply have to add email This is an RFC 3463 extended status code. I'd be ok sending it privately, if it matters.

if I've been completely incompetent and screwed something up ). At one point when this happened, I deleted the affected site and associated users and domains (DNS records included) from the ISPConfig control panel, emptied the recycle bin, and recreated them. All failed.

Reject messages may look like this: does not like recipient. 550-Previous (cached) callout verification failure 550 Sender verify failed Remote host said: 550-Verification failed for postfix/smtpd[28384]: NOQUEUE: reject: RCPT from mail-ie0-f171.google.com[]: 550 5.1.1 <[emailprotected]>: Recipient address

Solution: Verify the MX records for a domain, using the command: dig domain.com MX If you notice DNS errors or missing MX records, then contact the recipient server support and get There are typos in the recipient’s email address, which means that the address to which you are trying to send the email has never existed. At times, a typo in the email address of the recipient can cause this email delivery failure. There is one strange thing though, this particular domain has 2 mx records.

To learn more, see Backscatter messages and EOP. Newer Than: Search this thread only Search this forum only Display results as threads Useful Searches Recent Posts More... SimonH, Nov 17, 2008 #9 falko Super Moderator ISPConfig Developer What's in /etc/postfix/main.cf? 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.

  1. Solution: Examining the error logs and email headers of the bounced mail would help identify the issue with the mail server.
  2. If you're using Outlook 2010 or Outlook 2013 To remove invalid recipients from the user's auto-complete list in Microsoft Outlook 2010 or Microsoft Outlook 2013, do the following: Remove a single
  3. Home 550 5.1.1 User unknown when sending from external email server by Chris Francis on Jan 30, 2013 at 12:30 UTC | Microsoft Exchange 0Spice Down Next: Email Confidentiality Best Practices
  4. In the example [email protected] 9/21/2011 4:50 PM The e-mail account does not exist at the organization this message was sent to.
  5. We're here to help you with any queries.

Filtering for incoming mails using email filters or anti-spam firewalls, can end up bouncing emails from certain sender servers, returning a 550 error message. https://bobcares.com/blog/how-to-fix-550-5-1-1-user-unknown-email-error-in-exchange/ What I can tell you, is that it contains the following (company.tld is my company domain, customer.tld is the domain of the customer having this problem currently); apollo:~# cat /etc/postfix/local-host-names | append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h # TLS parameters smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_use_tls = yes smtpd_tls_session_cache_database = btree:${queue_directory}/smtpd_scache The thing I find strangest about this, is that [emailprotected] (the proper users email address on the ispconfig server) seems to be getting converted to [emailprotected]name.

To do this, open the mailbox in a web browser that supports only the light version of Outlook Web App, and use the following procedure: Remove all recipients Open the user's navigate here Wednesday, March 20, 2013 2:48 PM Reply | Quote 0 Sign in to vote Are you sure you have checked the email address carefully? If you try this and it doesn't work immediately give it ~5 minutes and try again. 0 Pimiento OP tomaspanta Feb 13, 2015 at 9:57 UTC 1st Post A missing alphabet or an incorrect character can end up messing an email address.

This is set up to prevent specific data leaving the network (like social security numbers), stop outbound spam, and other potentially bad situations. Try free trial now! Required fields are marked *Comment * Name * Email * CAPTCHA Code* Get the best web hosting and server administration information in the industry right in your inbox. Check This Out asked 3 years ago viewed 100665 times active 1 year ago Visit Chat Linked -1 recipient rejected in a SMTP connection from a OpenVz container Related 3Exchange bouncing email sent by

They’ll have to resolve the issue in order to prevent NDR 5.1.x errors. but local-host-names looks ok ... _X_, Nov 18, 2008 #14 _X_ New Member I cannot imagine what could cause your server to rejects mail from one domain and accepts from more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

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Yes, my password is: Forgot your password? For instance, the MX records for the domain could be wrongly resolving to the recipient mail server instead of its intended server. If you change something, send the email again. If all good, contact recipient server support and get the email filters verified for any erroneous filters or rules that can be blocking mails. 4.

This type of useless automated message is called backscatter. Start typing the recipient's name or email address until the recipient appears in the drop-down list. Essentially, we have a problem with *some* people emailing users on our server. http://whistlemedia.net/smtp-error/smtp-511.html I also work with various other platforms and products, usually in the form of migrations.Microsoft is not a "religion" for me.

Your DNS record is stale and cannot be resolved by the recipient server. SMTP error 550 may generate from one of these systems that is inspecting outbound mail. Response: 550 Cyberoam Anti Spam Engine has identified Posted by Jack Feb 21st, 2015 misc, because the server is configured to not accept mail for that combination of sender and recipient addresses. –Jenny D May 14 '13 at 9:29 1 @JennyD If that's the case, Choose Service health to see an overview of any issues.

I guess the sending MTA's deal with that kind of DNS setup differently to others. I'm using a desktop version of Outlook 2007 and connecting through my ISP. In such cases, the recipient server would be unable to deliver the mail. Solution 2: Update stale mail exchange (MX) resource records    Error code 5.1.1 can be caused by problems with the mail exchange (MX) resource record for the recipient's domain.

Thanks, Simon SimonH, Nov 18, 2008 #11 _X_ New Member you have another mydestination: mydestination = /etc/postfix/local-host-names and this file is generated by ISPConfig post content of /etc/postfix/local-host-names _X_, Featured Tool Subnet Calculator This subnet calculator is the most simple and user friendly one out there. If we’re talking thousands of emails, you have to automate the process somehow. Adding to the problem, it's quite difficult to troubleshoot with senders who aren't my customer, but some are cooperative occaisionally, even though I haven't got anywhere with this in the end.