The reason behind the rule is that, someone keeps creative new addresses at Gmail/Yahoo/Hotmail with word “welcome” in the email address and sends spam emails to our mailboxes.
What will the best way to add this rule? Clifford On 22 May 2017 at 20:13, Viktor Dukhovni <[email protected]> wrote: > > > On May 22, 2017, at 11:23 AM, Clifford Gonsalves < > [email protected]> wrote: > > > > I would like to block any sender having the word "welcome" in the email > address. > > WHICH email address, the envelope sender, or the "From:" header? Blocking > on > header content is rather more prone to false positives than blocking > envelope > sender addresses. > > > I know this can be done with header_checks, I just need the syntax to > add this rule. > > But it is likely unwise to keep such a rule in place for any length of > time. > What counteracts a spam pattern lasting days to weeks eventually becomes a > source of false positives that makes inbound email unreliable. > > If it all possible avoid single-word anti-spam patterns. Find something > actually > objectionable in the content or work with IP reputation, ... > > -- > Viktor. > >
