System.web.mail mail content disappear

[me]

I am using system.web.mail mailmessage and smtpmail.send() to
send an email with html content. The problem is that part of
a link in the html body has disappeared when it arrives at its
destination. The link I send is "blah.aspx" but when recieved
it only contains "blahaspx", the dot is gone!? This only happens
when sending html with links through system.web.mail which uses
the IIS smtp virtual server. If I insert 2 dots like this
"blah..aspx" then I recieve "blah.aspx". Any1 know what is
happening here??