Debian 11 Bullseye
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Mail Server : Virtual Domain Setting2021/09/14

Configure for Virtulal Domain to send an email with another domain name different from original domain.
This example is for the case you use OS user accounts.
For example,
present domain name ⇒
new domain name ⇒
a User [debian] has an email address [],
a User [bullseye] has an email address [],
the user [bullseye] uses the same name for before [@] with [debian].
[1] Configure Virtual Domain.
vi /etc/postfix/
# add to the end of the file

virtual_alias_domains =
virtual_alias_maps = hash:/etc/postfix/virtual
vi /etc/postfix/virtual
# add   bullseye
postmap /etc/postfix/virtual

systemctl restart postfix

[2] Set new account to Email client and verify possible to send emails normally.
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