help with backscatter

[Jorey Bump]

Chris Harms wrote:

> To those who have kindly told me to go to the Sendmail groups, I suspect 
> Cyrus plays a part in our problem.  I'm now fairly certain that our 
> access db is misconfigured, with the reason stemming from using 
> "To:domain.tld RELAY" as a workaround for Sendmail not delivering to 
> Cyrus many moons ago.  I don't think we should need to do this, but I 
> distinctly recall it NOT working if we didn't have it in there.  I 
> suppose the 'duct tape' is coming unglued now.  I'm currently working on 
> putting together a development machine to try out 2.3.7 and removal of 
> the aforementioned lines in access db.
> 
> Any pointers on whether my hunch about the access file is correct or not 
> are welcome.

Allowing sendmail to relay based on header information is a recipe for 
disaster. It's possible that this is the cause of your problem, if 
sendmail is accepting messages from dictionary attacks and cyrus is 
refusing to deliver them.