ssmtp “FromLineOverride=NO” has no impact

René Neumaier <[email protected]> Wed, 27 Jan 2021 16:20:52 +0100

Newsgroups	gmane.linux.debian.user.testing
Message-ID	<[email protected]>

Hello together,

a new lxd container with debian bullseye has to send emails to a SMTP-
Relay. The chosen software is ssmtp 2.64-9 and the configuration looks
like that:


/etc/ssmtp/revaliases

# sSMTP aliases
# 
# Format:   local_account:outgoing_address:mailhub
#
# Example: root:[email protected]:mailhub.your.domain[:port]
# where [:port] is an optional port number that defaults to 25.
root:[email protected]:mailout.example.com
www-data:[email protected]:mailout.example.com


/etc/ssmtp/ssmtp.conf

#
# Config file for sSMTP sendmail
#
# The person who gets all mail for userids < 1000
# Make this empty to disable rewriting.
[email protected]

# The place where the mail goes. The actual machine name is required no
# MX records are consulted. Commonly mailhosts are named
mail.domain.com
mailhub=mailout.example.com

# Where will the mail seem to come from?
#rewriteDomain=

# The full hostname
hostname=srv0815

# Are users allowed to set their own From: address?
# YES - Allow the user to specify their own From: address
# NO - Use the system generated From: address
FromLineOverride=NO


I can send an email as following and everything looks like expected:
www-data@srv0815:~# echo "Test message" | mail -s "Test message - is
from?" [email protected]


But if I send an email with an additional "from field" like this...
www-data@srv0815:~# echo "Test message" | mail -s "Test message - is
from?" [email protected] -a From:[email protected]


...I will receive the email with the given "From address" (e.g.
[email protected]). But this shouldn't be possible!? I've
explicitly set "FromLineOverride=NO" in my configuration. Therefore, as
far as I know, ssmtp should ignore any additional "from field".

The same configuration works as expected on another container with
gentoo linux. Is it a bug? Did I missed some setting? I am grateful for
any hint.


Best,
René


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