[Mimedefang] Hot do I stop becoming a spam relay.
mimedefang at nabs.net
Sun Mar 11 12:01:03 EST 2007
On 11 Mar 2007 at 14:35, Andrew Watkins wrote:
> First of all my sendmail does not allow relaying, but I am now getting a
> lot of e-mail where email is sent to an unknown local user and then
> there is a BCC to some other location:
> for example:
> From: spammer at domain.com
> TO: XXX at ourlocal.domain.com
> Bcc: someone at external.com
> I guess the letter of the of the law I should deliver the e-mail, to the
> external address, since typo 's do happen, but there must be away round
> it. May be I could not deliver Bcc if the to address is invalid?
First, if there is a "Bcc:" header in the incoming SMTP data, the
server at the other end screwed up...the whole point of "Bcc:" is that
other recipients aren't supposed to know about it.
Second, sendmail doesn't deliver based on headers from SMTP data...it
delivers based on the "RCPT To:" command in the SMTP transaction. So,
whatever might be in a "Bcc:" header isn't going to do anything.
Now, if you have some program to deliver the e-mail locally that looks
at headers and creates a new e-mail message if there is a "Bcc:"
header, then that's the problem.
"sendmail -t" is an example of a command that does this sort of header
parsing. It's really only used for initiation of sending mail, and I
think it's ignored when in daemon mode, but check to see if you are
starting your daemon with this flag, just in case.
Jeff Rife |
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