Hi folks!
I've another question to you out there.
We customized some Mailimports for specific Projects. They work just fine.
But if some Mail is importet into Jira blank lines blow up the whole email.
Sometimes it happens, that one blank line looks like 3 blank lines in the Issue-Description.
Please see my screenshot. 
The importet Message blows up and reading is really difficult.
I would be very grateful, if somebody knows how to configure.
Thank you and best regards
Mario
Edit:
We use JETI (Jira Email This Issue)
https://marketplace.atlassian.com/plugins/com.metainf.jira.plugin.emailissue