![]() All SMTP Error 111 errors usually point to an inability of your server to communicate with the remote SMTP server (either the recipients SMTP server or your ISPs SMTP server) or to a Linux/SMTP software configuration problem, typically /etc/hosts not being world readable, or a newly installed or reconfigured firewall preventing connection to the remote SMTP server, or incorrect hostnames and/or domains (e.g. The message will usually go like this : Connection refused, 111 Cant open SMTP stream. SMTP Error 111 : Typically from Linux based email systems such as SquirrelMail and Mailman. All SMTP Error 101 errors usually point to a configuration problem, such as an incorrectly spelt SMTP server, or an IP address that does not exist, or an SMTP port that does not exist or which the recipient will not accept SMTP connections on, or some other process is already using the default SMTP port, port 25. Typical replies will be SMTP Error 101, Error opening connection or SMTP Error 101, cannot open SMTP stream. What the message may meanSMTP Error 101 : Typically your SMTP server or email program is unable to even start an SMTP session. ![]() SMTP Status Codes101 Cannot open connection Finally, there are no better tools for resolving complex SMTP error situations than the WHOIS, Name Server Lookup, Trace Route, and PING tools of our own The Ultimate Troubleshooter available on our website that is how we ourselves quickly solve complex SMTP error situations. ![]() Note : the following list of SMTP reply codes can also be used to troubleshoot Eudora or FoxMail email problems, Outlook error codes, Outlook Express error codes (Windows 2000/XP), Windows Mail Error Codes (Vista), Thunderbird problems, or other email program problems when those programs send and collect emails directly to and from the Internet as opposed to through a corporate email system. What does 550 mean ? What does 550 5.1.1 mean (or, shortened, what does 511 mean ?) ? What does Data not accepted mean ? What is SMTP error 553, what does it mean ? So, use this document as a quick reference to common Mail Delivery Errors, SMTP status codes or SMTP error codes for SMTP mail servers such as AA Mail Server, Alt-N MDaemon, ArGoSoft Mail Server, Axigen Mail Server, Barracuda Spam Firewall, Chilkat SMTPQ, CMail, CMailServer, E-Mail Anywhere, FTGate, GMS Mail, Internet Anywhere, Kerio MailServer (KMS), Lotus Notes, MailEnable, Mailman, MailMax, Mailtraq, Merak Mail Server, Microsoft Exchange (Exchange Server 2003 NDR, Non-Delivery Report, error codes), Novell GroupWise, Qmail, PostCast Server, PostConf, PostFix, PowerMTA, QK (QKSoft) SMTP Server, Rockliffe MailSite, SendMail, SquirrelMail, SurgeMail, TFS Secure Message Server, VisNetic Mail Server, WinMail, Zimbra, or any other SMTP / ESMTP standards compliant e-mail MTA. It is just for such cases that we have produced this document (we use it too !! J ). A classic reply might be, for example, SMTP error from remote mail server after end of data : 550 Error: Message content rejected, or SMTP error from remote mail server after RCPT TO, 550 5.1.1 User unknown or SMTP Error: Data not accepted or SMTP Error: The following recipients failed. Depending on the actual problem it is encountering, your mail server may not be able to provide detailed help on how to resolve the problem, and may instead only be able to provide you with an SMTP Status Code in your servers log (these codes are also known as SMTP Error Codes or SMTP Reply Codes), or emails will be returned to the sender with error text. After checking the usual suspects such as lack of connection (your broadband line is dead), faulty router, firewall problems, DNS problems, or an incorrect SMTP server name (thanks to some clever ISP changing its SMTP server name without informing anyone it happens!!), you will likely start delving a little deeper by checking if your email server reports any errors. Sometimes these problems will be with the interfacing of the mail server with the ISP, in particular an inability to send mail. What is SMTP Error ? What does it mean ? There comes a time in the life of a Computer Consultant where, one day, he/she will have to deal with email server problems. SMTP Error Codes & SMTP Status Codes & SMTP Reply Codes Reference 2010 SMTP Status codes SMTP Error Codes SMTP Reply Codes 2010
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