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alec@dt:~$ sudo dpkg --configure -a

Setting up postfix (3.1.0-3) ...

setting myhostname=dt.8.8.4.4 in /etc/postfix                                                     <=====

 

Postfix is now set up with the changes above.  If you need to make changes, edit

/etc/postfix/main.cf (and others) as needed.  To view Postfix configuration

values, see postconf(1).

 

After modifying main.cf, be sure to run '/etc/init.d/postfix reload'.

 

Running newaliases

newaliases: warning: valid_hostname: numeric hostname: 8.8.4.4

newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter value: 8.8.4.4    <=====

dpkg: error processing package postfix (--configure):

 subprocess installed post-installation script returned error exit status 75

Processing triggers for libc-bin (2.23-0ubuntu3) ...

Errors were encountered while processing:

 postfix