If you track a bounce and figure out who it was originally to, then do a search on that address via google or similar, and you'llmost likely find the info sitting in some web-page (mis-spelled, archived or active) - then you know for sure it wasn't a lapse of open relay.

[quote user="Peter Strömblad"]

Also, you say you don't worry too much about inbound, - you should! If your mailserver is reported as an open relay, you will be treated as a spammer. Now, since you most likely only will allow SMTP connections from the very same machine, insert Allow 127.0.0.1 into connection control options of MercuryS module.

[/quote]

Sorry to but in but would that be as well as my IP address or instead of?
Thanks
Lynn

What are you trying to configure Lynn?  Ben's situation was a bit unusual.

Hi PaulW

I continually get bounce messages as though I have sent out large maildrops but when I look at the email addresses these are not anyone we have sent mail to so just trying to make sure that I have open relay locked up tight (have the not allow relay boxes all checked).
Maybe this should be moved to a different thread so as not to interfere with this thread?
Lynn

Using an innocent party's address is a common form of spamming and happens to most of us :(

You may be able to suppress some of it by using SPF or similar, but that should go into a different thread.