Email Error 501
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reply codesSometimes your SMTP server may return a particular error message. The problem is that it will generally be very cryptic, like "550 Requested action not taken: mailbox unavailable" smtp error 501 or "421 Try again later". What does these numbers mean?First of all: not
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any reply code is an error. Sometimes it's just a response containing a detail about the server or an answer
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to a command. Secondly: any code consist of three digits, and each conveys a particular information. The first one defines whether the server has accepted the command, fulfilled an action, run into
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a temporary issue, encountered an error etc; the second and the third one refine the description further, stating if there's been a syntactic problem, or a connection trouble etc.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 550 error 501 (net::err_insecure_response): unknown error. chrome to 559. In particular, you will probably get a lot of 550 SMTP error codes – that is, a problem that concerns the recipient's email address.Finally, remember that it's much easier to deal with these error codes if you choose to rely on a professional SMTP server that will help you solve any issue. turboSMTP, for instance, comes with a 24/7 customer support: you can try it free and forget once for all these issues.And here's a list of the main SMTP error or reply messages, with an explanation and a tip about what to do. CODEMEANINGHOW TO SOLVE IT / WHAT TO DO101The server is unable to connect.Try to change the server's name (maybe it was spelt incorrectly) or the connection port.111Connection refused or inability to open an SMTP stream.This error normally refers to a connection issue with the remote SMTP server, depending on firewalls or misspelled domains. Double-check all the configurations and in case ask your provider.211System status message or help reply.It comes with more information about the server.214A response to the HELP command.It contains information about your particular server, normally pointing to a FAQ page.220The server is ready.It's just
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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 Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up 5.5.1 501 Error, Can't Send Mail [closed] up vote 0 down vote favorite In the last 4 days, my mail server cant send mail to some domains. I receive these errors: (abc (at) aygaz.com.tr), Result: failed, Status: 5.5.1 501 Syntax error in command parameter(s) Domain name expected (abc (at) total.com.tr), Result: failed, Status: 5.5.1 501 Syntax: HELO hostname (abc (at) telemaks.com.tr), Result: failed, Status: 5.5.1 501 Syntactically invalid HELO argument(s) (abc (at) ziraatbank.com.tr), Result: failed, Status: 5.5.1 501 Syntax error in parameters or arguments (abc (at) normsan.com), Result: failed, Status: 5.5.1 501 5.5.1 HELO/EHLO requires domain address I looked the log files for last 2 years, but find this problem only last 4 days. I searched the error code, but cant solve the problem. Error code descriptions tell same things. "Your email adress, domain invalid, character problem etc." There is Kerio Mail Server 6.7 on Windows Server 2003. I tried to send from different IP adresses, domains, web mail/outlook and disabled antivirus program on the server but problem can't solved. Mail server ip adresses aren't blocked by blacklists. What is the reason of this problem, and how can I solve it? Thanks. sendmail share|improve this question asked Jul 27 '11 at 8:50 Faruk KAHRAMAN 3629 closed as off topic by Hans Olsson, Will Sep 2 '11 at 14:35 Questions on Stack Overflow are expected to relate to programming within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question. add a comment| 1 Answer 1 active oldest votes up vote 1 down vote accepted Typically, after connec