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1# Define special delivery for emails to @gmail.com:
2transport_maps = hash:/etc/postfix/maps/transport
3
4# Sender-dependent relays are defined in this map:
5sender_dependent_default_transport_maps = hash:/etc/postfix/maps/sender_transport
6
7# Gmail authentication:
8smtp_sasl_password_maps = hash:/etc/postfix/maps/sasl_passwd 
9     
10@gmail.com      gmail: 
11     
12@gmail.com      smtp:[smtp.gmail.com]:587 
13     
14gmail        unix -     -       -       -       -       smtp
15  -o smtp_header_checks=regexp:/etc/postfix/maps/rewrite_headers_gmail 
16     
17/^From: (.*)@mycompany.org/   REPLACE From: real+$1@gmail.com 
18     
19[smtp.gmail.com]:587    real@gmail.com:...password...