Triangle (yield sign) with !
I can't receive email on the Mail app. The symbol is not the "lightning in a circle" on. It is a triangle (like a Yield sign) with an exclamation mark in it. What does this mean?
iMac 27″ 5K, macOS 10.14
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It means that the email account's connection to its respective email servers is "broken." It could be for a number of reasons, including:
- The email server is down.
- The email server has moved or no longer exists.
- There is an issue with your email user credentials and cannot connect to the server to access it.
I suggest starting by using Apple's Connection Doctor to see if accessing the email server is the issue.
Ref: Use Connection Doctor in Mail on Mac - Apple Support