Noissue - Remove faulty postconf custom configuration

Noissue - Remove faulty postconf custom configuration

Due to us configuring the mydestination field, postfix was unable to recognize
mails coming from local accounts, resulting in it trying to send replies (for
example for bounced emails) to the external IP of the account.

Consider the old configuration (before this commit):

    root@acceptableads-com-1 ~ # postconf | grep 'mydestination ='
    mydestination = localhost.localdomain, localhost

In the above configuration, we are missing the domain
"acceptableads-com-1.adblockplus.org", because emails from nginx will be sent
from nginx@acceptableads-com-1.adblockplus.org.

The default configuration (which we override) includes the domain:

    root@acceptableads-com-1 ~ # postconf -d | grep 'mydestination ='
    mydestination = $myhostname, localhost.$mydomain, localhost

    root@acceptableads-com-1 ~ # postconf -d | grep 'myhostname ='
    myhostname = acceptableads-com-1.adblockplus.org

By removing the configuration line, we ensure that postfix recognizes emails
like the one from nginx above as being from local accounts.

See http://hub.eyeo.com/issues/1487#note-2

[mathias, 2017-06-12 21:21:03]

LGTM.