Should allow us to load-balance outbound email better among the
available mail-frontend servers, in combination with the mailman
RR patch.

web-users: make sure units start on dependent package upgrades

See merge request !259

Make sure the unit is enabled after deployment

After the change is deployed verify the resulting units are enabled.

irc: point sasl to services

See merge request !258

Replace awk-based regular expressions with 'jq' parsing the JSON
postqueue output, which is more accurate as it does not depend on the
exact syntax of the queue IDs.

They're very verbose and generally result from legacy themes / plugins
misusing the core Wordpress code.

Ensure conference MUC component certs are specified

See merge request !257

Add 'wipe-mailbox' action to the queue system

See merge request !249

This is now part of base "float".

Fixes issue ai3/prod#310.

mailman: Enable VERP

See merge request !255

Improve bounce detection.

Also reduce the number of recipients per single SMTP delivery.

Subscribe a test user to the test list.