Forum Emails with links to my site recognized as spam

[محروم.كوم]

Hi
Recently I noticed users are not activating their accounts, so probed and found the activation emails are going to spam box. After hours of testing one thing is clear now; when there is a link to my forum in the message body, it will go right to spam box, if not it will be OK. This does not make so difference whether I send it via VB or webmail program. Does anyone have any idea how I can fix this problem? __DEFINE_LIKE_SHARE__