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I've configured my postfix/amavisd-new/spam-assassin setup after this tutorial https://help.ubuntu.com/community/Postfix/DKIM. But now the problem is that all mails I send are double signed with two DKMI Headers, one before and one after the mail is sent to amavisd-new. How can I prevent this behavior?

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closed as off topic by mdpc, kce, MadHatter, Khaled, Dave M Feb 5 at 13:20

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to disable milter processing after amavis, add to your master.cf in the after-amavis section

127.0.0.1:10025 inet    n       -       -       -       -       smtpd
[....]
-o smtpd_milters=

if you want to run the milter after amavis, set the smtpd_milters= configuration option in main.cf to an empty string and add the inet:localhost:8891 configuration to master.cf instead:

-o smtpd_milters=inet:localhost:8891
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