Error Smtp 554 5.7.1
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view Printable view Export to Adobe Acrobat (PDF) Export to Microsoft Word Email this page Other pagesHome page Dashboard News Recent updates RSS feed builder Index Site map Labels Attachments index People Directory AccountLog in History History 554 5.7.1 Delivery http://kb.mit.edu/confluence/display/istcontrib/554+5.7.1+Delivery+not+authorized not authorized Question I tried to send MIT email and got an email error "554 5.7.1", what does it mean? 554 5.7.1 Delivery not authorized 554 5.7.1 You are not allowed to connect Answer It probably http://serverfault.com/questions/403108/how-to-fix-the-email-message-was-detected-as-spam-554-transaction-failed means that MIT's spam filter blocked the mail. Knowing why the mail was blocked is harder - our spam filter (Symantec Brightmail) can block various messages for various reasons. Symantec's official answer to the topic is error smtp here: http://www.symantec.com/docs/TECH169847 - Message Rejected with SMTP Code 554. 5.7.1 MIT-specific answer While Symantec's official answer gives a few bullet points for people to work through, we will comment that the most common situations encountered by IS&T Customer Support are: problems with the sender's reputation problems with the sender's DNS. Sender's Reputation When a sending site connects to MIT to submit mail, MIT's spam filter does some lookups based on the error smtp 554 IP address of the connecting site. If the spam filter determines that the sender's IP address has a "negative reputation", it will reject the mail with a 554 5.7.1 error. To investigate problems with the sender's reputation, consult http://ipremoval.sms.symantec.com/lookup/ Sender's DNS In addition to considering the reputation of the sender's IP address, MIT's spam filter also checks to see if the sender has configured reverse DNS for their IP address. Loosely speaking, MIT requires that the sender have a properly-configured hostname, and treats them as a spammer if they do not. The message "Delivery not authorized" could happen for multiple reasons: no reverse DNS record exists for the connecting IP address the reverse DNS record exists for the connecting IP address, but the 'A' or 'AAAA' record of the resulting domain does not match the connecting IP address the domain provided at HELO and EHLO has neither an 'A', nor an 'AAAA', nor an 'MX' record in DNS Here are some Symantec articles about the checking the sender's DNS: http://www.symantec.com/docs/TECH198845 http://www.symantec.com/docs/HOWTO53867 http://www.symantec.com/docs/TECH179206 Other considerations The most important question to start with is "when the sending site contacts MIT, what IP address does MIT see?" Reputation and DNS lookups start with the IP address. Unfortunately, mail errors do not always give a good report
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How to fix: The email message was detected as spam 554 Transaction failed? up vote -1 down vote favorite Everything was working fine, no changes to DNS or Email Server settings. Then we got the error below when some users (not all) send emails (some user and domain names and ip's have been changed). This happens to some email users only. De: MAILER-DAEMON [mailto:MAILER-DAEMON] Enviado el: lunes, 25 de junio de 2012 01:49 p.m. Para: someuser@bizdomain.com Asunto: Undelivered Mail Returned to Sender This is the mail system at host mail182-ch112-RR.bigfish.com. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system