Postfix is an open source mail transfer agent (MTA), for the routing and delivery of email. This post examples how to forward an email to another local or remote email user using Postfix MTA.
It provides a method of redirect mail to another user for both local and remote users. You need to configure /etc/postfix/aliases (or use /etc/aliases) file. The aliases file (read as table) provides a system-wide mechanism to redirect mail for local recipients. The redirections are processed by the Postfix local delivery agent.
Normally, the aliases table is specified as a text file that serves as input to the postalias command. The result, an indexed file in dbm or db format, is used for fast lookup by the mail system. Execute the command newaliases in order to rebuild the indexed file after changing the Postfix alias database.
Open file /etc/postfix/aliases using vi text editor:
# vi /etc/postfix/aliases
Save and close the file. The abuse name is the local address which be receiving the mail on the local machine. [email protected] is the email address on another domain to forward to (the value can be a username on the local machine or the email address). This can be a single or multiple values separated by commas.
To redirect root email to tom user:
root: [email protected]
Type newaliases command to build new database:
To troublshoot problem further see postfix server log file:
# tail -f /var/log/mailog
Jan 8 03:56:33 www330 postfix: p089uXvh013209: from=root, size=29, class=0, nrcpts=1, msgid=<[email protected]>, [email protected] Jan 8 03:56:33 www330 postfix: p089uXZH013210: from=
, size=337, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1] Jan 8 03:56:33 www330 postfix: p089uXvh013209: to=root, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30029, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (p089uXZH013210 Message accepted for delivery) Jan 8 03:56:34 www330 postfix: STARTTLS=client, relay=cyberciti.biz.s9a1.psmtp.com., version=TLSv1/SSLv3, verify=FAIL, cipher=AES256-SHA, bits=256/256 Jan 8 03:56:36 www330 postfix: p089uXZH013210: [email protected], ctladdr= (0/0), delay=00:00:03, xdelay=00:00:03, mailer=esmtp, pri=30576, relay=cyberciti.biz.s9a1.psmtp.com. [202.xxx.yyy.zzz], dsn=2.0.0, stat=Sent (Thanks)
The above output indicates that mail sent to local root account is forwarded to [email protected] via smtp server called cyberciti.biz.s9a1.psmtp.com. If you do not have admin access to the mail server, use the .forward file from your own home directory to forward an email to another account.