Unable to configure email alerts if the local network domain is localdomain

[parthjoshi-pc]

Because of a quirk of the rockstor Django application, if your local network has its default domain configured as localdomain, then it is not possible to configure email alerts. This is because Rockstor automatically adds an entry to the /etc/default/generic postfix lookup table with the domain name localdomain and then tries to add another entry for the default domain of the host. This leads to a duplicate entry being added in the lookup table with the postmap command failing with the following error:

CommandException: Error running a command. cmd = /usr/sbin/postmap /etc/postfix/generic. rc = 1. stdout = ['']. stderr = ['postmap: warning: lmdb:/etc/postfix/generic: duplicate entry: "@hostxxxx.localdomain"', 'postmap: fatal: error updating lmdb:/etc/postfix/generic: Invalid argument', '']

This can be fixed trivially by not adding the extra entry in this case.

[phillxnet]

Closing as:
Fixed by #2374
Thanks again to @parthjoshi-pc for also providing the fix. Much appreciated.