Redmine

Hello,
I have a redmine instance installed on a vps:

• redmine 3.3.3
• mySQL
• Apache+passenger

I created an issue, assigned it to a developer and saved the issue. the page keep loading and I finally received an internal error.
I checked the redmine log file (production.log) and I found that there is an issue with mail notification. In fact, my email server was down during my issue creation, so redmine failed to send the email and a rollback occurred on my issue creation!!!
Isn't this a strange behaviour, why issue creation should fail if notification email fails. For me, notification should be a separate module from issue tracking module!!!
What do you think?

Cheers,
Slim