Linux – forward email to external domain (postfix)

Forward email to external domain in postfix (linux):

apt-get install postfix

-> configure as a internet site -> domainname: mail.MYDOMAIN.TLD


nano /etc/postfix/main.cf

 # change
 myhostname = MYDOMAIN.TLD
 mydestination = mail.MYDOMAIN.TLD, localhost.com, localhost

 # insert at the bottom of the file
 virtual_alias_domains = MYDOMAIN.TLD
 virtual_alias_maps = hash:/etc/postfix/virtual

nano /etc/postfix/virtual

 user@MYDOMAIN.TLD user@EXTERNALDOMAIN.TLD


postmap /etc/postfix/virtual

/etc/init.d/postfix restart

set the mx record of MYDOMAIN to mail.MYDOMAIN.TLD.
set the a record of the subdomain mail to the ip address of MYDOMAIN
set the ptr record from the ip address of MYDOMAIN to MYDOMAIN.TLD
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