My main IMail server is very secure and I have no problems with it. I use the SMTP feature of IIS6 on a different server as my "store and forward" mail server in the event my IMail box is down. This is where the problem is!
all MXs must be able to implement policies. Can MS SMTP SVC implement policies? If not, it sucks worthlessly as an MX (eg, your experience).
My store and forward server is getting hit with about 500 messages a minute. Only about 2% of those messages are valid. The bandwidth this uses really pisses me off.
with spam running at 70 to 90% at many MXs, any SMTP service that requires receiving ALL msgs in totality before rejecting will cost you $1000s/year in lost bandwidth.
Some of the big IMGate MXs I admin for my clients would be burning 1 or 2 T-1s (sometimes mores) on spam alone if it weren't for IMGate. That's $750 to $1500 bandwidth lost PER MONTH for cheapest N.America T-1s, and MUCH more for non-NA. E-1s.
Are the spammers intentionally looking for lower priority MX records?
of course. They look for port 25 on ALL IPs, and they are doing that much more aggressively, by the week.
Is there any way to eliminate this problem (maybe I've overlooked something in the setup)?
For the MS SMTP SVC as MX, no.
Any suggestions would be appreciated...
Use an front-end MX that can implement policies, and preferably policies based on envelope info alone. IMGate is used by many Imail sites.
Using your (user services) mailbox server as an MX is getting less practical as spam increases. Separating mailbox services and MX policies onto two different boxes is the best way to go.
I'm sure others have this same problem!
of course. and it's getting noticeably worse by the week.
Len
_____________________________________________________________________ http://MenAndMice.com/DNS-training : Denver; NYC; San Jose http://IMGate.MEIway.com : free anti-spam gateway, runs on 1000's of sites
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