From the recursion-is-not-a-good-thing™ department: When in a transaction, we add e-mails to the mailing_stating database so they can be sent once the transaction is committed. This creates an infinte loop if there is a problem with the database. The solution is to add an extra parameter to the MessageToMTA sub to always send an e-mail and not use the queue.
Checked all places that MessageToMTA was called, and also updated the upstream patch (b_g 448574)
This was original released in 4.4.2018-2 but since it never was released publicly, will be part of 4.4.2019. -- simon
This change is now live. If there are any issues, do not reopen this bug. Instead, you should create a new bug and reference this bug. -- simon