On 28 Mar 2016, at 17:53, jaso...@mail-central.com wrote:

Hi,

How would I match/block access to mail sent from MTAs that have FQDNs that start with

    mta-wk-*

it's not a header, it's not content, it's not an IP ...

From the magical command "man 5 postconf" you can find this and many other valuable facts about configuring Postfix:

   check_client_access type:table
      Search the specified access database for  the  client  hostname,
      parent  domains,  client  IP  address,  or  networks obtained by
      stripping least significant octets.  See  the  access(5)  manual
      page for details.


I expect you can deduce similar informative incantations for pcre_table(5) or regexp_table(5) which will aid you in figuring out a complete answer.

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