I don't know if anyone can help me with this, but I really do hope so.
I am IT manager for a very small firm - we have 4 members of staff and run a small network on XP. Obviously, we are quite used to being bombarded with spam and viruses, most of which gets intercepted at the gateway by our AV software.
However, over the last few days we have had a disturbing new development. One of the partners here keeps getting "message undeliverable" messages for addresses he has not sent any emails to. Obviously, we are being spoofed and while this would not normally cause me too much heartache as I just see it as one of those things you have to put up with (unless anyone can advise otherwise!) the subject and contents of the emails are particularly offensive - some sort of [bleep] propaganda from my limited understanding of German - as opposed to just the usual crap about viagra and cialis.
I am very keen to stop this but I do not know how or whether it is possible.
Can anyone please help?