

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.

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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. Reply Codes Reference 2010 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 AnswersThatWorkTM SMTP Status codes SMTP Error Codes SMTP Reply Codes 2010
