I have bene using 

https://regex101.com <https://regex101.com/>


for test and evaluation    It has also helped on my composition



> On May 14, 2015, at 6:48 AM, Barbara M. <barb...@rfx.it> wrote:
> 
> 
> I am trying to use regexp to block mails from specific domains to specific 
> users (and let other users receive it).
> 
> I need to merge (logical AND operator), something like:
> 
> /^From:.*\@.*domainsource.tld/      REJECT  No Unrequested mail Please
> /^To:.*\@.*domaindest.tld/      REJECT  No Unrequested mail Please
> 
> For my needs I want these rules evaluated in AND.
> 
> How can do this with a valid rules in my /etc/postfix/header_checks?
> If there is a better solution ... ;-)
> 
> Thanks, B.
> 

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