In reference to the following page:
http://dkimproxy.sourceforge.net/postfix-outbound-howto.html

it includes the following:
submission  inet  n     -       n       -       -       smtpd
    -o smtpd_etrn_restrictions=reject
    -o smtpd_sasl_auth_enable=yes
    -o content_filter=dksign:[127.0.0.1]:10027
    -o receive_override_options=no_address_mappings
    -o 
smtpd_recipient_restrictions=permit_mynetworks,permit_sasl_authenticated,reject


however I do not send emails from my desktop using port 587, I use port 25 as 
standard.

How could I include the line "-o content_filter=dksign:[127.0.0.1]:10027" in a 
manner where only OUTBOUND emails only are passed through DKIM proxy, and not 
incoming emails? Yes, I am well aware that SMTP does not draw a distinction 
between the 2, but I am thinking there must be a way, or do I have to send 
emails via a port other then 25 to achieve this?

On this topic has anyone found a good DKIM signing solution that will work 
with multiple domains?

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