Exchange 2010 Sending to certain mail domain fails

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S

Sembee [MVP]



Based on the information that you have provided, none at all.
You need to post the NDR to begin with, as that will provide some key information.

Simon.

Simon Butler, Exchange MVP
Blog | Exchange Resources
 
S

Scott Feltmann



shaw.ca could see you as a SPAM domain.

You need to post the header but I would suspect it is their end doing it.

SF - MCITP:EMA 2007 and 2010, MCTS: Exchange 2010, Exchange 2007, MOSS 2007, OCS 2007 -- http://www.scottfeltmann.com
 
J

Justin.King



Spam detection is an ever evolving game of cat and mouse. In general, the first thing you should _always_ do when playing these games:

1. Make sure the IP address you send as (what ever is NATed) has an A: record.

2. Make sure your send connector's FQDN matches that A record.

3. Make sure the reverse lookup _once_again_ matches that A record.

Basically however someone wants to scan for validity, you should answer. If your server says HELO mail.company.com, but when the other end ping -a your IP and gets company.com .... you could get flagged as spam depending on how aggressive they set things.
 
G

Gavin-Zhang

Hi MoeAyache,
Any update for your issue? Due to not enough information regarding to your issue, sure, it is suggested that your could check the issue from two sides(your side and receive side).
And above gave some good information for you.
Regards!
Gavin
 
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