Posfix - deny sender emails containing specific text in username

Question

Postfix, Debian. I'm receiving spam and I'm not sure how can block it, because spammers uses different mail address everytime.

For example: mike.newsletter30@gmail.com mike.sfsd4f564s6df45ds@gmail.com mike.newsletter30u@gmail.com

etc.

I have setup sender access file, so I can block mails from specific servers like this:

mike.newsletter30u@gmail.com REJECT

But it's not enough. I need to setup more specific rule, for example all senders containing 'mike.' should be blocked in this case.

Unfortunatelly, rule like this: mike. REJECT

doesn't work. I've searched google and postfix docs I still can't figure out how to do this. Is this even possible?

Do you have any ideas?

Answer 1

2 Years and no clarification :S Note that it is a regular expression, Using:

/^(F|f)rom: *mike*@gmail.com/

won't work because you are thinking of * as a wildcard, regex uses * to match preceding character 0 or more times, the dot (.) is used to match any character, so the regex to match fsdghfsdjmike84329@gmail.com should be something like

/^(F|f)rom: .*mike.*@gmail.com/

Answer 2

First ensure that you have enabled header checks in your main.cf

header_checks = regexp:/etc/postfix/header_checks

Then add a matching rule to your checks for example:

/^(F|f)rom: mike.*@gmail.com/ REJECT JUNK is not allowed by this server

Finally restart/reload postfix to active changes.