Archive for January, 2010
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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by admin on Jan.26, 2010, under Mail
SMTP Error 354 : This is normally in response to the DATA command. The server has received the From and To information and is now asking for the “Message Body”, the main part of the message which should be ended by two blank lines separated by a dot (period). Therefore, on receiving an SMTP Reply 354 the sending server should send the body of the message to the receiving server and indicate the end of the message body with <CRLF>.<CRLF> (note the full stop between the two Carriage_Return-Line_Feed’s).
Incoming search terms:
354 Start mail input; end with252 – Cannot VRFY (verify) the user – the server will accept the message and attempt to deliver it (also called SMTP Error 2.5.2)
by admin on Jan.26, 2010, under Mail
SMTP Status 252 : The user account appears to be valid but could not be verified, however the server will try do deliver the message. 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. 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. When this happens the gateway server will reply with an SMTP Error 252 telling your sending server that it cannot verify the user part of the email address, that the domain part is OK, and that it will forward your email to a server which can do the checking and eventually deliver to the user mailbox if it exists.
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by admin on Jan.26, 2010, under Mail
SMTP Status 251 : The email account is not local to the ISP server but the ISP server will accept the email and will forward it (the server will RELAY your message, this is the most common action for ISP Mail servers – the recipient will see your ISP in the mail header as one of the first hops on the way to the recipient’s email system). SMTP Error 251 is therefore more of an informational message for technicians tracking how a message reached its destination.
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by admin on Jan.26, 2010, under Mail
SMTP Error 221 : The server is ending the mail session – it is closing the conversation with the ISP as it has no more mail to send in this sending session. SMTP Status 221 is often misconstrued as an error condition, when it is in fact nothing of the sort. The mail server is simply telling you that it has processed everything it was given in this particular session, and it is now going back into waiting mode. Because SMTP status 221 is often misinterpreted, with some mail servers the Network Administrators have changed the default text of SMTP Reply 221 to something more meaningful and less alarming. For example, a typical SMTP reply 221 might say “221 Goodbye” or “221 Closing connection”, or the most irritating one we’ve seen “221 Bye”, Arrrgghh – can you blame anyone for thinking there might be a problem ? Of course not ! So some Network Administrators are these days being quite imaginative by changing the default text of SMTP reply 221 to more user friendly messages like : “221 Thank you for your business” (I love that one!), or “221 All messages processed successfully in this session, SMTP connection is closing”.
