I’m running Mac OS 10.11.6 on a MacBook Pro and I’m using Mailspring 1.9.2.
For some reason, unknown to me, some recipients are not getting my emails and some are. I just sent identical emails with an attachment to my mac.com and gmail.com accounts and neither one received it. Now, sending from my gmail account, I received the message so evidently it’s something to do with my mac.com account. As far as I can tell, it’s set up through iCloud?
It appears that I receive all my emails.
This is very frustrating and, at times, critical and I’m at a loss as to what to do.