Web Links Get Split In Emails Sent

Sometimes when I send a web link in the body of an email, it gets broken up in 2 pieces. It always seems to split it in the same place. For example, if I was sending a link to an auction on ebay to a few friends, I would just copy and paste the URL in the email. Everything on my end looks fine. I send it out and almost always get a response back saying the link doesn't work. When I look at the body of the reply to me, I see that the link is broken in 2 pieces. The funny thing is it's almost always broken right after a "?" which is part of the URL (about 30 characters in). It's almost as if Mac Mail or something is treating the link like it's a long sentence. It sees a question mark in the address and says, "Hey this sentence runs into the other. Lets do this guy a favor and put a space after the "?" and then a return so the next sentence in on the next line down." This has been frustrating more than once. I've looked through every preference I know of for some format, message composing setting that I've missed.

Has anybody else run into this??

Quicksilver Dual Gig Mac OS X (10.4.5) 1.5gb RAM