Hi,
i've got an exchange 2007 server and today strange things have started happening.
i have users who suddenly cannot send to certain domains - which was working up to yesterday.
so i've been running tests.
i have just got a user to send to 2 emails to one of the problem domains. One worked and one didn't! The one without an attachment worked, the one with didn't. I don't know if the problem is with attachments?
Looking at the smtp send log one of the emails the email that sent successfully has a clear username in the log.
The one that didn't send has just empty brackets for the senders.
the error message is: 550 Backscatter Protection detected an invalid or expired email address.
Here is a log of the email that didn't go successfully:
2009-09-15T13:37:53.269Z,mydomain smtp mail,08CC00320D682BCC,1,192.168.64.4:34388,213.189.141.60:25,+,,
"220 mail.somewhere.ch ESMTP MDaemon 10.1.0; Tue, 15 Sep 2009 15:37:12 +0200",
EHLO mydomain.co.uk,
"250-mail.somewhere.ch Hello 88-132-97-202.dsl.zen.co.uk, pleased to meet you",
250-ETRN,
250-AUTH=LOGIN,
250-AUTH LOGIN CRAM-MD5,
250-8BITMIME,
250 SIZE 20000000,
59553,sending message
MAIL FROM:<> SIZE=1235516,
"250 <>, Sender ok",
RCPT TO:<some.one@somewhere.com>,
550 Backscatter Protection detected an invalid or expired email address,
QUIT,
221 See ya in cyberspace,
and here is one that did go:
EHLO mydomain.co.uk,
"250-mail.somewhere.ch Hello 88-132-97-202.dsl.zen.co.uk, pleased to meet you",
250-ETRN,
250-AUTH=LOGIN,
250-AUTH LOGIN CRAM-MD5,
250-8BITMIME,
250 SIZE 20000000,
59966,sending message
MAIL FROM:<my.user@somewhere.co.uk> SIZE=3017,
"250 <my.user@somewhere.co.uk>, Sender ok",
RCPT TO:<some.one@somewhere.com>,
"250 <some.one@somewhere.com>, Recipient ok",
DATA,
"354 Enter mail, end with <CRLF>.<CRLF>",
"250 Ok, message saved <Message-ID:
5F6C3E30FD32264FBC9D3C6BAB60E9860CDE625301@mydomain.co.uk>",
QUIT,
221 See ya in cyberspace,
have changed user details as it's a bit security conscious here.
Anyone know what could remove a senders name from the header? Surely including an attachment doesn't do this??
Sorry for such a long post - but i thought putting in all details saves time.
i've got an exchange 2007 server and today strange things have started happening.
i have users who suddenly cannot send to certain domains - which was working up to yesterday.
so i've been running tests.
i have just got a user to send to 2 emails to one of the problem domains. One worked and one didn't! The one without an attachment worked, the one with didn't. I don't know if the problem is with attachments?
Looking at the smtp send log one of the emails the email that sent successfully has a clear username in the log.
The one that didn't send has just empty brackets for the senders.
the error message is: 550 Backscatter Protection detected an invalid or expired email address.
Here is a log of the email that didn't go successfully:
2009-09-15T13:37:53.269Z,mydomain smtp mail,08CC00320D682BCC,1,192.168.64.4:34388,213.189.141.60:25,+,,
"220 mail.somewhere.ch ESMTP MDaemon 10.1.0; Tue, 15 Sep 2009 15:37:12 +0200",
EHLO mydomain.co.uk,
"250-mail.somewhere.ch Hello 88-132-97-202.dsl.zen.co.uk, pleased to meet you",
250-ETRN,
250-AUTH=LOGIN,
250-AUTH LOGIN CRAM-MD5,
250-8BITMIME,
250 SIZE 20000000,
59553,sending message
MAIL FROM:<> SIZE=1235516,
"250 <>, Sender ok",
RCPT TO:<some.one@somewhere.com>,
550 Backscatter Protection detected an invalid or expired email address,
QUIT,
221 See ya in cyberspace,
and here is one that did go:
EHLO mydomain.co.uk,
"250-mail.somewhere.ch Hello 88-132-97-202.dsl.zen.co.uk, pleased to meet you",
250-ETRN,
250-AUTH=LOGIN,
250-AUTH LOGIN CRAM-MD5,
250-8BITMIME,
250 SIZE 20000000,
59966,sending message
MAIL FROM:<my.user@somewhere.co.uk> SIZE=3017,
"250 <my.user@somewhere.co.uk>, Sender ok",
RCPT TO:<some.one@somewhere.com>,
"250 <some.one@somewhere.com>, Recipient ok",
DATA,
"354 Enter mail, end with <CRLF>.<CRLF>",
"250 Ok, message saved <Message-ID:
5F6C3E30FD32264FBC9D3C6BAB60E9860CDE625301@mydomain.co.uk>",
QUIT,
221 See ya in cyberspace,
have changed user details as it's a bit security conscious here.
Anyone know what could remove a senders name from the header? Surely including an attachment doesn't do this??
Sorry for such a long post - but i thought putting in all details saves time.
