Email stops being sent after a few hours, I think some gets delayed somewhere and is eventually sent sometime after the restart but not immediately (I need to investigate this more). I thought it might be a grey listing issue but after restarting Lucee and IIS email is sent and received instantly.
The email is being sent from Lucee via Office 365.
There are no failed email Tasks in Web Admin.
I have seen other posts from 2016 & 2017 with same issue but no solutions.
Same issue on 220.127.116.11 & 18.104.22.168.
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OS: Win Server 2019
Java Version: 11.0.3
Tomcat Version: 9.0.20
Lucee Version: 22.214.171.124 & 126.96.36.199