SMTP Status Codes and Error Messages from Error 551 – 552


SMTP status code – 551 – User not local or invalid address – Relay denied.
(also called SMTP Error 5.5.1)
SMTP Error 551 : If neither the sending mail address nor
the recipient’s address are locally hosted by the server,
then the ISP’s servers may refuse to relay the message
Some ISPs implement this restriction to thwart spammers.
In our view, here at AnswersThatWork, this is a lazy and
incompetent method of fighting spam as most of the time it
does nothing but inconvenience no-one other than the
ISP’s vast majority of considerate and law abiding users.
In our experience this usually goes hand in hand with

barely competent technical support. At the time of writing,
14-Sep-2008, a typical culprit for this is BT, British
Telecom, in the UK. The way in which it manifests itself is
as follows : you have a domain that is hosted by but your ISP is and
you try to send emails from your domain to
Neither your domain nor Yahoo.usa are hosted by, as a result your email is not accepted by
DodgyISP’s mail servers and your mail server is returned
an SMTP Error 551. To correct the problem you have to
call and ask them to enter your domain
name as an allowed sender.

SMTP status code – 552 – Requested mail actions aborted – Exceeded storage allocation. or Size of the incoming message exceeds the incoming size limit
(also called SMTP Error 5.5.2)
SMTP Error 552 : The recipient’s mailbox has reached
its maximum allowed size (this is often accompanied by
a return mail from your ISP or mail server informing the
sender of the email of just that situation).
Example : “552 sorry, mailbox
is over quota temporarily (#5.1.1)”.
Some mail servers have extended the scope of SMTP
Reply Code 552 by also including errors where the size of
the incoming message exceeds the size limit specified
by the Network Administrator, as in, for example,
“SMTP Error 552 5.2.3 Message size exceeds fixed
maximum message size (7000000)”, which effectively
says that the incoming message was larger than the 7MB
limit (7,000,000 bytes) set by the Network Administrator of
the recipient’s mail server

Above are list of SMTP Errors Codes and Status Codes along with Error and Warning messages from Error 551 – 552 received while performing certain operation against mail server applications or related products.

What are SMTP Error Messages?
Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (e-mail) transmission. SMTP protocol is used for sending e-mail messages between servers. Most e-mail systems that send mail over the Internet use SMTP to send messages from one server to another; the messages can then be retrieved with an e-mail client using either POP or IMAP.

In general, each SMTP error contains the following information:
• The SMTP Status Code or SMTP Error Codes or SMTP Reply Codes
• The message text. This text is usually returned with the Error code. Some messages employ word substitution, where the word substituted represents the system-replacement of a term more specific to the occurrence.
• An explanation of how the error may have occurred.

Hope this was helpful.

SQLServerF1 Team
Information about SMTP Error Codes or Status Codes and Error Messages on Windows, Linux Operating Systems.


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