Mail "cannot verify server identity"
Hi I'm using Mail 11.5 for several email accounts. At the moment one email account will not send or receive mail. I keep getting
Mail "cannot verify server identity. I have fines this on my iPhone by turning off the SSL slider - but have no idea how to resolve this on my Mac Mini running High Sierra 10.13.6
I'll be glad of your assistance.
Mac mini, macOS High Sierra (10.13.6)