Michiel Hazelhof via Postfix-users:
> Let's specify in main.cf:
>
> header_checks = pcre:/etc/postfix/header_checks.pcre
>
> In /etc/postfix/header_checks.pcre add:
>
> /^Subject: (.*?)RandomStringToKeepEverythingFunctioning(.*?)$/ REJECT
>
> Then send an email where the subject contains
> "RandomStringToKeepEverythingFunctioningMoreText", it will get rejected
> (correctly)
>
> Now let's send another email where the subject contains
> "RandomStringToKeepEverythingFunctioning`MoreText", will pass the
> filter, the left single quotation mark (U+2018) will make the email
> bypass all regex/pcre filters.
Delete the (.*?)$ at the end.
Replace the (.*?) at the start with .+
Wietse
_______________________________________________
Postfix-users mailing list -- [email protected]
To unsubscribe send an email to [email protected]
