Incoming email create issue too slow for particular JIRA Project

[Mark]

We are using JIRA v7.1.10. The JIRA application is listening to several email address (using IMAP) to generate issue to different JIRA projects.

The function works properly. However, recently one of the project have a slow respond. It takes about 30 minutes to create a jira issue for that particular project. In the same time, other projects only take 15 minutes.

Anything we can improve this particular project incoming email?

[Andy Brook]

Such delays are usually indicative of IMAP protocol and LARGE email payloads.  POP/s is much faster, review that as a first pass.   If you're stuck on IMAP, possible this page will help.

https://thepluginpeople.atlassian.net/wiki/spaces/JEMH/pages/57606174/Download+performance+of+POP+vs+IMAP