On one of my server I've been running sme 5.1.2. With RAV antivirus. Been running this forever now and have always been totally satisfied.
A few days ago, I upgraded that box from 5.1.2 to 5.6. RAV failed in this regard:
When trying to connect, I get an SMTP error: 451 message refused...
Uninstall RAV and everything is back to normal.
I built a brand new server, straight 5.6 out of the box. Everything works. Then I install RAV (current version on ravantivirus.com, for esmith and/or redhat, both look exactly the same) and I get that 451 message refused.
Any idea? All howtos about RAV and SME are gone, and 5.6 is a huge step from 5.1.2 so I got a little lost with the mailfront and all that. It does look like RAV is properly chaining itself in, and last maillog does indicate "switching to RAV log" but the RAV log stays very much empty.