I setup the email box which is a gmail address, xxxx@gmail.com, on "admin/config/system/inmail/deliverers"
I tested it and it works
i clicked 'Process fetchers' and the display reads that it processed emails.

In the directions state:

All emails parsed by Mailhandler need to have a subject that begins with [node][{content_type}] (for nodes) or [comment][{#entity_ID}] (for comments). The first parameters is an entity type ID while the second one is a content type or an entity ID. Both parameters needs to be valid.

If I did both and neither worked:
[node][event] and [node][{event}[

From: Person on the site <their login email address >
Date: Fri, Mar 23, 2018 at 5:06 PM
Subject: Re: [node][{event}] Test event
To: xxx@gmail.com

Test event 2

Date:
Start: March 31
Start time:  1pm
End:  March 31
End Time: 3pm

Stuff goes here

I also tried this one

From: Person on the site <their login email address >
Date: Fri, Mar 23, 2018 at 5:06 PM
Subject: Re: [node][event] Test event
To: xxx@gmail.com

Test event 2

Date:
Start: March 31
Start time:  1pm
End:  March 31
End Time: 3pm

Stuff goes here

how do I troubleshoot this also?

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SocialNicheGuru created an issue.