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Mailer.with_synched_deliveries source:/trunk/app/models/mailer.rb@21350#L639 will not detect other async queue adapters than the Rails core ActiveJob::QueueAdapters::AsyncAdapter (such as those used by external queuing systems such as the DelayedJobAdapter, ResqueAdapter or SidekiqAdapter).

With these queue adapters in normal use, Mailer.with_synched_deliveries does nothing. This can lead to problems as it is expected that email deliveries (in our case daily reminders) would run inline but instead they were attempted to be scheduled using the normal queue adapter.