From header filter not working as expected

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dcol
Posts: 237
Joined: Fri May 26, 2017 11:25 pm

From header filter not working as expected

Post by dcol »

A lot of spam comes in with the email of info@<domain>. I have setup a filter 'Where the From header contains specific words' as *info@*
This filter only catches about 50% of these emails.
I look at the source and the From: field always has info@, but the 'info' is replaced by a string of random characters on the emails that make it through this filter in the filter log, but the SMTP logs doesn't show this.

How can I trap all of these emails?

Admin
Site Admin
Posts: 1127
Joined: Mon Jun 10, 2002 6:31 pm
Location: Melbourne, Victoria, Australia

Re: From header filter not working as expected

Post by Admin »

The SMTP service does not log the "from:" header, but the envelope SMTP sender, which is the email address in the MAIL FROM SMTP command. If you just need to check the envelope sender you could make a scripted filter with something like:

If InStr(1,UCase("%SENDERADDRESS%"),"INFO@") > 0 then
FilterResult=1
End If

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