New 2017 imac. Email constantly shows the Yeild warning sign nearly all the time
I get this when I click on the yeild icon "Connections to host Automatically added for iOS & OS X Mail on the default ports failed."
I have tried multiple fixes found in other support communities. I get emal, and it sends, usually, not always right away. but the warning sign drives me crazy. The one fix I can do is the suggesteion to change SSL to SSL/t....somthing, I cant recall right now. That does not show up in Network or Account folder. The support article siad it would be in Account, which makes sence. But I cannot find it.
Is there some help for this. I bought this IMAC from Woot. It was new factory sealed box. But no Apple support. I did all upgrades of course.
Thanks in advance.
iMac 21.5" 4K, macOS 10.13