# Process Email queue

**URL:** <https://forum.mautic.org/t/process-email-queue/37474>\
**Category:** Mautic 6 Install/Upgrade Support\
**Created:** [March 12, 2026, 12:53pm UTC](https://forum.mautic.org/t/process-email-queue/37474 "2026-03-12T12:53:18Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![javierxul](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/javierxul/32/10181_2.png) [@javierxul](https://forum.mautic.org/u/javierxul)\
**Post date:** [March 12, 2026, 12:53pm UTC](https://forum.mautic.org/t/process-email-queue/37474/1 "2026-03-12T12:53:18Z")

</div>

**Your software** My Mautic version is: 6.0.2  
My PHP version is: 8.3  
My Database type and version is: MySQL/MariaDB

**Your problem** My problem is:

We’re trying to configure Mautic for queue-based email processing using Symfony Messenger with Doctrine transport (database queue). We followed the guide at [https://kb.mautic.org/article/configuring-doctrine-for-email-queue-management-in-mautic-with-cron-jobs.html](https://kb.mautic.org/article/configuring-doctrine-for-email-queue-management-in-mautic-with-cron-jobs.html)

**Current configuration:**

Complete cron jobs setup:

```auto
# Segments and campaigns
0,15,30,45 * * * * php /var/www/html/bin/console mautic:segments:update --env=prod
5,20,35,50 * * * * php /var/www/html/bin/console mautic:campaigns:update --env=prod
* * * * * php /var/www/html/bin/console mautic:campaigns:trigger --batch-limit=300 --env=prod

# Email queue processing
*/5 * * * * php /var/www/html/bin/console mautic:broadcasts:send --channel=email --limit=5000 --batch=500 --env=prod
* * * * * /var/www/html/bin/mautic_consume_email.sh

# Import/Export
*/5 * * * * php /var/www/html/bin/console mautic:import --env=prod
*/7 * * * * php /var/www/html/bin/console mautic:contacts:scheduled_export --env=prod

# Maintenance
0 * * * * php /var/www/html/bin/console mautic:custom-field:create-column --env=prod
0 2 * * * php /var/www/html/bin/console mautic:maintenance:cleanup --days-old=365 --env=prod

```

Lock file script (`mautic_consume_email.sh`) runs:

bash

```auto
messenger:consume email --time-limit=55 --memory-limit=512M --limit=2000 --env=prod

```

Email provider: Amazon SES (API mode, region eu-west-1, limits: 50/second, 100,700/day)

**The problem:**

When we send a mass email (30K+ contacts):

1. ✅ `mautic:broadcasts:send` enqueues messages to `messenger_messages` table

2. ✅ Mautic UI shows “31,571 Sent”

3. ✅ `messenger:consume` worker runs (1 worker only, lock file working)

4. ❌ **Messages get stuck in the database with status “failed”**

5. ❌ **Only 1,959 emails reach Amazon SES** (verified in CloudWatch)

6. ❌ **29,612 messages remain blocked in `messenger_messages` table** (93.8% stuck)

**Database query shows:**

sql

````auto
SELECT COUNT(*) FROM messenger_messages WHERE queue_name='email';
-- Result: ~29,000 messages stuck
```

**Worker verification:**
- Only 1 `messenger:consume` process running (verified with `ps aux`)
- Worker logs show successful execution (exit code 0)
- Lock file creates and removes correctly every minute

**The messages are enqueued but get blocked in the database instead of being processed and sent to SES.**

These errors are showing in the log:

Previously we had:
```
Doctrine\DBAL\Exception\LockWaitTimeoutException: 
SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded

````

This was caused by duplicate workers. We fixed it with a lock file script, but **messages still get stuck in the database with status “failed”** even with only 1 worker running.

Steps I have tried to fix the problem:

1. Implemented lock file bash script to prevent duplicate workers

2. Verified only 1 `messenger:consume` process runs at a time (no duplicates)

3. Commented out competing cronjobs (`mautic:messages:send`, `messenger:consume mautic_webhooks`)

4. Cleaned stuck messages with `TRUNCATE TABLE messenger_messages`

5. Verified SES limits are not being hit (50/second, 100K/day)

6. **Made a new test send today - same problem: messages enqueue but get stuck in database**

**Questions:**

1. Why are messages being marked as “failed” in `messenger_messages` even though the worker reports success (exit code 0)?

2. Is Doctrine transport suitable for 30K+ message volumes, or should we use Redis/RabbitMQ?

3. Are our worker parameters appropriate? (`--time-limit=55 --limit=2000` running every minute)

4. How can we debug why messages are getting stuck instead of being processed?

**The core issue:** Messages successfully enqueue to the database but then get blocked there with “failed” status instead of being sent to Amazon SES.

Any help would be greatly appreciated!

---

<div class="post-metadata">

**Author:** ![deepti](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/deepti/32/411_2.png) [@deepti](https://forum.mautic.org/u/deepti)\
**Post date:** [March 12, 2026, 2:13pm UTC](https://forum.mautic.org/t/process-email-queue/37474/2 "2026-03-12T14:13:16Z")

</div>

YOU have configured aws smtp or api ?

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<div class="post-metadata">

**Author:** ![javierxul](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/javierxul/32/10181_2.png) [@javierxul](https://forum.mautic.org/u/javierxul)\
**Post date:** [March 12, 2026, 3:01pm UTC](https://forum.mautic.org/t/process-email-queue/37474/3 "2026-03-12T15:01:29Z")

</div>

I have AWS SES + API configured.

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<div class="post-metadata">

**Author:** ![deepti](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/deepti/32/411_2.png) [@deepti](https://forum.mautic.org/u/deepti)\
**Post date:** [March 13, 2026, 12:48am UTC](https://forum.mautic.org/t/process-email-queue/37474/4 "2026-03-13T00:48:45Z")

</div>

Then it should work ,