Sending via REST API only sends a few emails

[fisch]

Your software
My Mautic version is: 5.1.0
My PHP version is: PHP 8.1.2-1ubuntu2.19
My Database type and version is: 10.6.18-MariaDB-0ubuntu0.22.04.1

Hello,

I’m creating a template email and sending it to a segment of 50k recipients using the REST API /emails/ID/send endpoint. The email is created correctly, and it is then sent to about 2.700 recipients. Then it just stops.

When I open the email that was created with the API and click “send” in the web interface, the remaining 47k emails are sent without problems. When I try to send to a smaller segment (10 recipients) with the API, all emails are sent on the first try.

I have no limits and enough allowance with my SMTP provider. There are no entries in the log file.

Thank you for reading, and kind regards!

[fisch]

Solved my own problem by reading the docs. I was not aware that Mautic had switched to using queues as documented here.

Here’s what I did:

I enabled queueing with doctrine as described in the docs and set up a worker using systemctl. This is my service file:

# /etc/systemd/system/mautic-worker.service

[Unit]
Description=Mautic Messenger Worker
After=network.target

[Service]
User=www-data
ExecStart=/usr/bin/php /opt/mautic/bin/console messenger:consume email
Restart=always
RestartSec=5
StandardOutput=journal
StandardError=journal
Environment=SYMFONY_ENV=prod

[Install]
WantedBy=multi-user.target

I started and enabled the worker with

systemctl enable mautic-worker
systemctl start mautic-worker

Then I added the following line to the crontab. I measured that this call takes about 2 minutes, so I gave it 4 just to be sure:

*/4 * * * * sudo -u www-data php /opt/mautic/bin/console mautic:broadcasts:send --channel=email --limit=1000 --batch=1000

Now everything works as intended. Just make sure the emails are published and have publish_at date set, else they won’t get processed. Also set the unpunblish_at date if you don’t want contacts that are added to that segment after you’ve created the email to receive it.