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Update main.cf to allow aliases for sender addresses of apps

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If an app registers the sender address _app@doma.in_ **and** a yunohost account configured an alias for the same address the app will not be able to send emails anymore.

postfix asks the first map defined in smtpd_sender_login_maps and finds that the address _app@doma.in_ can be used as a sender address by the yunohost account having configured the alias and **then stops and doesn't look up the second list** for registered apps.

The unionmap instructs postfix to join a list from both sources and then return the match from that joined list which would then contain _yunohost_account_having_registered_alias, appname_ for the lookup of _app@doma.in_.

This allows the yunohost account having registered the alias and the app being registered to use the sender address to send email using that sender **and makes it possible to receive replies to the emails going out from the app**.

Reference: https://serverfault.com/questions/948362/postfix-multiple-smtpd-sender-login-maps
This commit is contained in:
Chris Vogel 2024-05-18 14:03:32 +02:00 • committed by GitHub
parent c459ddabbd
commit 1c7e139c74
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1 changed files with 2 additions and 2 deletions
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conf/postfix/main.cf
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@ -107,12 +107,12 @@ virtual_alias_domains =
virtual_minimum_uid = 100
virtual_uid_maps = static:vmail
virtual_gid_maps = static:mail
smtpd_sender_login_maps=
smtpd_sender_login_maps = unionmap:{
# Regular Yunohost accounts
ldap:/etc/postfix/ldap-accounts.cf,
# Extra maps for app system users who need to send emails
hash:/etc/postfix/app_senders_login_maps
}
# Dovecot LDA
virtual_transport = dovecot