I was having a similar issue yesterday. Emails were arriving 3 hours after they had been sent from the client. Not ideal! Seems to have resolved itself now.
I’ve always had this issue.
I refresh my gmail but no new email shows, 10 minutes later i do and an email shows up with a timestamp of 15 minutes ago.
The sender also uses gmail and we always face this problem.
I dont have any problems with Gmail (web client, hosted by Google).
Never had problems but never needed that fast email conversation.
I bet it’s gonna lag when I’ll be needing it
yes, but the sender have gmail I’ve checked. So is strange.
Have you checked out any of these resources?
Here’s a more general version: How to check why an email was delayed
Good luck with it!