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How do I
make sense of undelivered
email error message?
The usual source
of failed mailing is
that your ISP mail server has some requirements for outgoing or return
(Reply To) email addresses. Getting one or more error message like 501, 502,
503,
etc. from your ISP email server or when your email messages being broadcast fails
consistently with one or more error message.
When broadcasting
emails, the program engage the SMTP email transaction commands;
HELO, MAIL
FROM, RCPT TO, DATA and
QUIT with the mail server to open a
connection, send mail and end the transaction. Your ISP mail server response
includes acknowledgment, confirmation and notification of problems with
numeric reply error codes such as
501, 502 or 503, etc.
See:
How
Email Works
There are no standard mechanisms for reporting mail system errors except for the limited codes consisting of
3 numbers with text descriptions like;
501 Syntax error in parameters or arguments
Indicating intermittent drop
in network line connection that caused your mail client to send erroneous
command to the mail server.
Or
502 Command not implemented
Indicating that
your ISP mail server did not recognized a command sent.
See:
SMTP
Return Codes Error
Notes:
If the
transaction beginning HELO
command argument is not acceptable a 501 failure reply must be returned. If
the commands in a transaction are out of order a 503 failure reply must be
returned.
Command
A request for
mail service action sent by the sender SMTP to the receiver SMTP
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