missing email

Hi,

Like it appaears to be alluded to in other posts I am completely missing an email in emClient (IMAP)

When ssh’d into my mail server I can confirm the message is still there: http://imgur.com/SRPQ0tg

It exists in my webmail: http://imgur.com/ynu5BA0

And also in my android client (gmail to imap): 
http://imgur.com/jU6MfTM  http://imgur.com/b1vDjA9

However in emClient nothing shows up. Even if I use a search of this form:

matt after:“26/06/2017 5:00:100 PM” before:“26/06/2017 6:00:00 PM”

The main flag is that this is a 22mb email which makes me think somehow it was mid-way through downloading and got race conditioned or interrupted somehow.

My questions are:

  1. What is the best way to get this email into emClient? It is useful to access.

  2. What mechanisms could possibly cause this?

  3. Is there a way to rebuild/recheck the database? I was not able to find any information for this in the online documentation.

In an of itself this isolated incident is not a big deal. However it also potentially explains other historical incidences of emails I have missed, so I would like to try to get to the bottom of this if possible.