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TBC.  May involve re-generating certificates.

Postfix

Change the postfix configuration files

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Update by editing:

• /etc/aliases  If it is changed, run the newalises command.
  
• /etc/mailname
  
• Do not restart or reload postfix until all files have been updated
• Change the hostname in /etc/postfix/header_checks.  checks  If the file doesn't exist, create it using the procedure at http://wiki.bluelightav.org/x/PAIW . Do not restart or reload postfix until all files have been updated.  

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• If it is changed, run the postmap command on it, in the /etc/postfix directory.
• /etc/postfix/generic 

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• If it is changed, run the postmap command on it, in the /etc/postfix directory.

Update /etc/postfix/main.cf by (replacing <hostname> and <domain>):

• postconf -e myhostname=<hostname>

• postconf -e mydestination=<hostname>,localhost.<domain>,localhostpostconf -e 'smtp_header_checks = regexp:/etc/postfix/header_checks'

Restart postfix:

/etc/init.d/postfix reload

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