On Tue, Feb 20, 2024 at 06:02:22PM -0500, Wietse Venema via Postfix-users wrote:

> - You'd better add $$ at the end of the pattern, to anchor the regular 
> expression.

Actually, that hostname is typically followed by additional data
separated by whitespace or a ';'.

>   header_checks = pcre:{ {/^Authentication-Results: \Q$myhostname\E$$/ 
> IGNORE} }
> 
> Note that pcre, not regexp.

Indeed PCRE is best here:

    header_checks = pcre:{ {/^Authentication-Results: \Q$myhostname\E[\s;]/ 
IGNORE} }

-- 
    Viktor.
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