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Miloš Đakonović
Asked: 2021-03-02 06:04:21 +0800 CST

Postfix change "From: " address when redirecting received email

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When redirected, received email from my server preserves the original "From: " address, which isn't favorable since that address may (and usually do) have SPF protected domain, among other reasons.

This looks like:

How can I deal with this: can I rewrite "From: " address but only in case when email is redirected and according to some map?

It is a standard Virtualmin email setup with Postfix and /etc/aliases.

virtual_alias_maps = hash:/etc/postfix/virtual
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases

/etc/postfix/virtual

[email protected]    name.domain

/etc/aliases

# See man 5 aliases for format
postmaster:    root
clamav: root


name.domain: [email protected],\name.domain
postfix

1 Answers

  1. Preserving the From: is not a problem since SPF checks are not done against the From: header. In fact, it is a great idea not to touch the From: header since emails from @gmail.com usually have this From: header signed with DKIM.

    You need to rewrite the envelope sender, which you may see in the email headers as Return-Path:. This answer provides one possible solution to your problem. To quote it here:

    I fixed this with postsrsd by following this guide: https://www.mind-it.info/forward-postfix-spf-srs/

    In short:

    Download and compile the software

    cd ~
wget https://github.com/roehling/postsrsd/archive/master.zip
unzip master
cd postsrsd-master/
make
sudo make install

    Add postfix configuration parameters for postsrsd

    sudo postconf -e "sender_canonical_maps = tcp:127.0.0.1:10001"
sudo postconf -e "sender_canonical_classes = envelope_sender"
sudo postconf -e "recipient_canonical_maps = tcp:127.0.0.1:10002"
sudo postconf -e "recipient_canonical_classes = envelope_recipient"

    Add SRS daemon to startup

    sudo chkconfig postsrsd on
# Start SRS daemon
sudo service postsrsd restart
#Reload postfix
sudo service postfix reload
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