![]() Try again later.Ĥ51 – The command has been aborted due to a server error. This indicates that the server is ready to accept the message itselfĤ21 – The service is not available and the connection will be closed.Ĥ50 – The requested command failed because the user’s mailbox was unavailable (such as being full). Here is a general list of SMTP error codes, and what each message is supposed to say and mean:Ģ14 – A help message for a human reader follows.Ģ50 – Requested action taken and completed.Ģ51 – The recipient is not local to the server, but the server will accept and forward the message.Ģ52 – The recipient cannot be VRFYed, but the server accepts the message and attempts delivery.ģ54 – Start message input and end with. It is the way that your sending email server connects with the email server on the other end. But what exactly do they mean? Why should you care and what should you do? And why do we say that SMTP error 550 is dreaded? SMTP Error Codes and What They Meanįirst, ‘SMTP’ stands for Simple Mail Transfer Protocol. ![]() These are often returned in bounced email, such as “550 Requested action not taken: mailbox unavailable” or “550 5 2 1 mail from refused spam site.” They are in response to SMTP commands that have ‘gone wrong’ between your email server that sent the email, and the receiving email server that is unable to deliver it (or refuses to deliver it) for some reason. ![]() SMTP codes can be so confusing, especially those SMTP response codes and SMTP error codes like the dreaded SMTP error 550.
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