Double sending issue with queue worker

serveradmin_au

Some subscribers are receiving duplicate emails from our campaigns. We're running 4 queue workers via Supervisor.

This happens intermittently — not every campaign, but about 1 in 5.

AcelleMail v4.6, Redis queue driver, 4 workers.

devops_marc

This is a race condition with multiple workers picking up the same job. Make sure your Redis connection has the block_for option set:

// config/queue.php
'redis' => [
    'driver' => 'redis',
    'connection' => 'default',
    'queue' => 'default',
    'retry_after' => 600,
    'block_for' => 5,
]

Also, reduce workers to 2 and increase retry_after to 600 (10 minutes) so slow jobs don't get retried while still processing.

sarah_dev

We've identified the root cause — a missing database lock on the campaign sending job. Fix is in v4.6.1 (releasing this week). The block_for workaround helps in the meantime.

serveradmin_au

Updated to v4.6.1 and no more duplicates after 3 campaigns. Thanks for the quick fix!