Sent items showing "Delayed" on many emails

I’ve been running the trial of EM Client on my Macbook to try it out. So far, I’m pretty impressed - however, I’m seeing a number of emails listed in sent items as ‘delayed’ - I can’t figure out why this is. I checked with one of the recipients and she noted that she received the email in question - so not sure what’s going on, but it is concerning me.

Any thoughts / suggestions?

I have the same problem. All my outbound from my IMAP account are delayed 6 hours. Your post is a year old. Did you ever find a resolution?