Apex Mail Queue stopped sending

Suddenly the APEX mail queue on our production server has stopped sending emails. We have logged into the internal workspace as ADMIN and can see the emails in the queue. There are no errors against them. We've tried both using the "Send all mails" button and also apex_mail.push_queue() from sqlplus but neither has worked - the emails are just backed up. There are no emails in the sent log with errors.
The configuration is no different from our development server (ie, same SMTP server, same setup within APEX) and that works fine. We haven't made any changes to anything, it just randomly stopped working the other day.
We have tried using UTL_SMTP on the prod server and that works fine, so it looks like it's something APEX specific.
Can anyone offer any advice or help before I raise this as an SR?
Thanks,
John

You should run this query as DBA to see ORACLE_APEX_MAIL_QUEUE job run details.
This job should run for every 5 min or 3 min depending on your apex version. See the latest run date.
When you run apex_mail.push_queue; then, it should do the same task what above job does. Pushing the queue didn't help you. So I suggest to raise a SR with Oracle Support.
Regards,
Hari

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