421 – <Server name> Service not available – the sending email program should try again later (also called SMTP Error 4.2.1)
by admin on Jan.26, 2010, under Mail
SMTP Error 421 : The Mail transfer service is unavailable because of a transient event. SMTP reply 451 can be caused by many things but generally indicates that the mail server which returns this status code is currently unavailable but may be available later.
For example, the server administrator may have stopped the mail service to troubleshoot a problem, or the mail server is right in the middle of rebooting, or the mail server is currently processing too many incoming messages or incoming requests, etc…. Note : “Mail Server” in this case can be any of the mail servers on the message’s route – the sending server (your server), the ISP SMTP server, or the recipient’s mail server. Clearly, if you repeatedly receive an SMTP status 421 then the problem is no longer of a transient nature and you need to investigate or inform the relevant network administrator, ISP tech support, or the recipient.
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