# [2018.12.19] Shoot in the Foot

When I tried to 'harden' my `postfix` installation, I probably 
overreached myself a bit and set the parameter `inet_interfaces` to 
`loopback-only` which actually meant not to receive any mail from 
the outside world at all. Unfortunately, `postfix` doesn't apply 
this exact preference without being restarted (namely one should 
stop it and then start again, issuing the reload command does not 
suffice), so I set it, checked that everything worked after 
reloading `postfix` and was happy with that. Then I don't remember 
why but I needed to restart the server on the 15 Dec. So for several 
days, 15-17 Dec, I was not able to receive any emails to my 
self-hosted account. I should probably add some monitoring (and even 
alerting) for such cases.