From Altered After Mail Accepted

[wiskbroom]

I am seeing a few spams coming through with a from address (seen on my
postfix logs) that does not match the "From" address shown on my users
Outlook.  In fact my users are seeing a "From" address as their own,
something that my postfix server currently does not allow using
mynetworks and permitting this using smtpd_recipient_restrictions.



Has anyone else recently encountered this problem?  



Thanks,



.vp