![]() ![]() When this happens the gateway server will reply with an SMTP Error 252 telling your sending server This can happen for example in very large corporation where the first email receiving server might only be an email exchanger server, a gateway server to the eventual server which holds the user mailboxes and which can verify if the intended recipient exists in that organization. There are sometimes circumstances where an email address appears to be valid but cannot be verified as definitely valid during the SMTP session between the sending server (your server) and the next server to accept your message. SMTP Status 252 : The user account appears to be valid but could not be verified, however the server will try do deliver the message. 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. (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. What does 550 mean ? What does 550ĥ.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 ![]() 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”. 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.ĭepending 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 server’s log (these codes are also known as SMTPĮrror Codes or SMTP Reply Codes), or emails will be returned to the sender with error text. 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 aĬomputer Consultant where, one day, he/she will have to deal with email server problems. ![]()
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