Where is the directory location of the email error queue in Jira. I know it sent by a Java module (SMTP?) but I'll like a more in depth review of the email sent failures.
Background:
I don't normally check Jira's email error queue but I did this morning and found 373 emails unsent since mid July. Most are from velocity templates I created 8 months ago and have not had an issue with. Most emails generated by these templates are still successfully sent out. I also ensured that each individual user could successfully be sent an email. I put these 373 failed emails back into the queue and 120 were successfully sent. I believe it is my ISP's SMTP that is hosing my email but I need explicit details.
Any pointers on debugging would help-- Thanks.