Thanks Kurt. We have never defined the ExternalPostmasterAddress on our customer's Exchange environments (I just checked a few of our other customer servers against the one in question to confirm I didn't misconfigure or skip a step).
And that is why it is odd for this customer to be seeing messages about policy violations. I think it may be settings defined on the 3rd spam filter (MX Logic/McAfee Saas), as that is currently managed by their webhosting company. I just didn't want to start pointing fingers without at least a bit of diligence on my end to rule some things out. *Had this sitting in the background while working with web hosting company* Turns out these were generated by the 3rd party spam filter. It is a setting on their end and they are going to disable it per the end-user's request. Thanks for the links. I'm still learning every day about Exchange, and I've noticed on several occasions that getting my head wrapped around something that would *seem* to have no bearing on another area, only to realize it's another cog in the wheel of Exchange. Thanks again for the help. I've seen numerous posts/responses by both you and Michael that I've flagged as "just in case I encounter this later". Just observing this list has certainly helped shorten my learning curve a great deal, so thank you (both) for that! -Geoff -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Kurt Buff Sent: Wednesday, February 12, 2014 11:46 AM To: [email protected] Subject: Re: [Exchange] Spam and Postmaster Question On Wed, Feb 12, 2014 at 10:29 AM, Geoff Orlebeck <[email protected]> wrote: > We recently replaced a new client’s SBS 2003 with Exchange 2010 SP3 UR4. > There is a user asking bout gaining access to Postmaster mailbox for > spam review. Am I crazy, or is the postmaster only used for NDR > delivery/replies? > This client has spam filtering provided by their web host (we are > working on changing that as well). But she states she previously > accessed [email protected] for their spam emails. I just want to > make sure before I reply back that I’m not off base here. The > ExternalPostmasterAddress property is designed for NDR and not spam, > correct? No spam emails will go and sit in the postmaster mailbox > defined on Exchange….right? You are sort of correct.Using the postmaster@ address as a catchall is normally a mistake. However, NDRs are usually delivered with a null sender address, not with postmaster@. Well, I'd argue that using a catchall address is a mistake anyway, but that's a whole other discussion. See https://www.ietf.org/rfc/rfc2142.txt for recommendations and requirements regarding standard email system accounts (I believe this is still the current RFC - but I haven't kept up for a few years). See also these fairly helpful links for a bit more info: http://en.wikipedia.org/wiki/Bounce_message https://www.roe.ch/MTA_BCP Kurt This message and any attached documents may be privileged or confidential and contain information protected by state and federal privacy statutes. They are intended only for the use of the addressee. If you are not the intended recipient, any disclosure, copying, or distribution of this information is strictly prohibited. If you received this transmission in error, please accept our apologies and notify the sender.
