[X-Newbies] How to block MailInfo and the like from phoning home from Mail.

[Brian Durant]

Anyone know how to block MailInfo
http://619219.sigclick.mailinfo.com/web/signature.htm and similar
programs from phoning home, when I am using Mail.app to receive mail?
I don't want to mark the e-mails as spam because it is job related,
but I would like to prevent this and similar programs from sending a
receipt back to the sender.

Cheers,

Brian