Linux and Virii

This may be OT, but I guess it could be concidered in the realm of ppp. 

I have a stripped down RH9.0 for for internet connection, and a Mandrake 
9 connected by LAN. Dial-up ISP with dynamic IP, and realitively short 
on-line time per connection (by choice, with no dedicated line, can't
tie up the phone). 

I've been hit with several infected emails in the last week or so. 
Recieving these virus' is not the problem, getting "returned" or "refused" 
mail from people and places I HAVE NOT SENT MAIL TO is the problem. 

A friend of mine has just finished setting up Squirrel mail on his Linux
system. He's been hosting my "domain" mail for some time now, and I have 
had no problems. It's just since I started using his Squirrel that I
started getting these returned mails. Is it possible that Squirrel mail 
has some vulnerability to infections? Or has someone just finally gotten 
around to "stealing" my address (it's one of many addresses, but it is
my "main" address). 

FYI I have never put my Windoze on line, and I never check suspect mail 
(that Linux can't display properly) with Windoze. If it won't display on 
Linux, I delete them. If I don't know the sender, I usually go ahead and 
check them out then delete them. 

Has anybody ever heard of Linux being infected, at least to the extent
of someons home dir? 

One more point. Alot of the mail I get is from friends who for some
reason or another never cut and paste messages, but just forward them
and forward them etc until the header is actually larger than the file
itself. 

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