wilderness - 4:53 pm on Jun 29, 2012 (gmt 0)
Assuredly. I get them all the time, although not from this particular server.
Visitors or forums pass on links to friends and other participants.
Many of these users utilize email services (Yahoo, Hotmail, Gmail and others), which could be a problem in and of itself, especially if your site (s) use anti-hotlinking.
If anti-hotlinking in place, than generally exceptions are required to the major email servers.
FWIW, SSID Forum more appropriate.