"Error while Pinging IMAP server imap.zoho.com.
Server unexpectedly disconnected: Connection timed out"

Additionally, I receive a similar message when Evolution is 'storing' to the inbox associated with 'imap.zoho.com'.

Both messages can be dismissed with a 'dismiss' button. Evolution seems to be working properly otherwise, and I seem to receive messages stored on 'imap.zoho.com' without delay or difficulty. That is, the error messages do not seem to indicate a material failure.  They are just there.

Evolution is set to check for messages on 'imap.zoho.com' every 22 minutes, but new messages seem to appear at intervals shorter than that.

I would like to know how to eliminate the error messages. Thank you for your help.

PS  I have taken this up with Ubuntu. They responded by suggesting that I ask zoho.  That exchange can be found here, should you have any interest.

Alas, it may just be 'one of those anamolies.'  As I said, zoho mail seems to the working fine in Evolution, otherwise. The error messages appear to be extraneous.