We do not have a BES... small company, no exchange, basic sendmail email server for now.
So I have an internal fax server that receives faxes and then emails a notification to a user. Fax comes in, fax server sends email to another mailserver (our main mailserver), which for some users forwards a copy to their BB.
Whenever one of those fax messages gets sent to the BIS email account it bounces with the following:
Code:
The original message was received at Mon, 10 Sep 2007 09:10:03 -0700
from [192.168.XXX.XXX]
----- The following addresses had permanent fatal errors -----
userxx@tmo.blackberry.net
(reason: 553 #5.1.8 Domain of sender address <fax@internalfaxserver.mycompany.com> does
not exist)
(expanded from: <user@mycompany.com>)
----- Transcript of session follows -----
... while talking to mx13.bis.na.blackberry.com.:
>>> MAIL From:<fax@internalfaxserver.mycompany.com> SIZE=84840
<<< 553 #5.1.8 Domain of sender address <fax@internalfaxserver.mycompany.com> does not exist
501 5.6.0 Data format error
To me this means that the BB network could not resolve the machine name of the originating server (the fax server) and refuses to accept the message. I don't really want to create a public A record for that internal machine. Are there any other workarounds?
Certain emails bounce from bb network citing DNS issue 
