Related Questions:
Why aren't I seeing my emails sync immediately?
Why is there a lag between when an email hits my email account and when it is available to reply to in ET?
Answer:
Currently, we initiate an email sync with the following triggers:
Going to a Contact Summary page that has an email thread
Going to a Booking Summary page that has an email
Going to the Mail heading in the left-hand sidebar (no need to click refresh)
Clicking refresh from the Emails page
Visiting the emails tab only syncs your own emails. Visiting a Contact or Booking Summary page syncs any inbox that has an email thread linked to that Contact or Booking.
Any of the above actions will send a trigger to fresh your emails once in a 15-minute period. If you visit those pages multiple times in a 15-minute period we don’t sync multiple times.
The sync runs in the background so to see the immediate sync results you will need to navigate away and visit back to the tab.
We are planning on improvements around this, you can upvote to be kept up to date here.