Service desk rejected email

Summary

Email sent to the service desk is rejected.

Steps to reproduce

1. Send email to service desk email.
2. Receive rejected response

[Rejected]

Unfortunately, your email message to GitLab could not be processed.

Gitlab::Email::InvalidIssueError

What is the current bug behavior?

Email sent to the service desk is rejected, no issue created. After resending it (or replying to the rejected email), new issue is created.

What is the expected correct behavior?

Email is not rejected.

Relevant logs and/or screenshots

There are no logs on our side or "Recent Deliveries" section in webhook's edit page. It looks like this request didn't pass to webhook?

Output of checks

This bug happens on GitLab.com

Results of GitLab environment info

N/A

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

N/A

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

N/A