Squashed commit of the following: 6093-mx-ip-match

commit cd4d2170
Author: Herman van Rink <rink@initfour.nl>
Date:   Thu Apr 28 21:32:02 2022 +0200

    Add found_mx to log message

commit 2f998784
Merge: 79a2d2ff 9954d8f5
Author: Herman van Rink <rink@initfour.nl>
Date:   Tue Mar 1 19:26:57 2022 +0100

    Merge remote-tracking branch 'origin/develop' into 6093-mx-ip-match

commit 79a2d2ff
Author: Herman van Rink <rink@initfour.nl>
Date:   Sun Mar 21 21:53:57 2021 +0100

    Add additional_smtp_hostnames option

commit f2d44575
Author: Herman van Rink <rink@initfour.nl>
Date:   Sun Mar 21 21:50:20 2021 +0100

    Rename to include .inc

commit c6931903
Author: Herman van Rink <rink@initfour.nl>
Date:   Sun Mar 21 21:30:45 2021 +0100

    draft additional_smtp_hostnames option

commit 59c86cd2
Author: Herman van Rink <rink@initfour.nl>
Date:   Mon Mar 8 15:33:09 2021 +0100

    String changes

commit 174013da
Author: Herman van Rink <rink@initfour.nl>
Date:   Mon Mar 8 15:32:39 2021 +0100

    Use hostname() and read additional_smtp_ips from ini config

commit 5a5afb38
Author: Herman van Rink <rink@initfour.nl>
Date:   Fri Mar 5 11:37:13 2021 +0100

    Fix schedule

commit a7206234
Author: Herman van Rink <rink@initfour.nl>
Date:   Mon Dec 7 16:29:28 2020 +0100

    set initial state

commit a17b6a21
Author: Herman van Rink <rink@initfour.nl>
Date:   Mon Dec 7 16:02:10 2020 +0100

    Fix record sorting, Update log messages

commit 38c9efa1
Author: Herman van Rink <rink@initfour.nl>
Date:   Thu Dec 3 15:31:42 2020 +0100

    Add a monitor check for MX records