Summary

When the subject of incoming mail contains a line feed and is encoded in UTF-8 with base64, Service Desk mail processor will not be able to create a new ticket from this email.

Steps to Reproduce

1. Configure a SD mail channel.
2. Send a test email with a subject that contains a line feed.
3. Verify the raw source of the incoming email : the subject is encoded in UTF-8 with base64, as shown in example below

   Subject: =?utf-8?B?VGhpcyBpcyB0aGUgMyBTdWJqw6hjdCAKIExpbmUgd2l0aCBicmVhayE=?=
   

Expected Results

A ticket is created from the incoming email.

Actual Results

Following error is thrown by mail processor asking for a valid value for the "summary" field:

Notes

Though the error message complains that there is no valid value for the "summary" field, from the screenshot, we can see that the Mail subject is correctly parsed.
The issue cannot be reproduced with JIRA mail handler.

Workaround

No workaround at the moment