I set up a Herald rule to prevent some users to do changes on a master branch.
The blocking mechanism itself works, but no mails are sent.
I already checked the maillog on the host. Mailing works in general. Other Herald rules can send mails also.
So I'm not shure if I missed anything.
I'm currently using phabricator in the version ab7dc13c67fde3c1fd53dfa945b940e010e5e8f9