IMAP problem

Hello,

I use mailbird and gmail app for zoho email under own domain. There is permanent problem with incoming and outgoing connection.

In the phone (android) account is not sync and when validate setting, I will get message

Couldn't finish
Can't connect to server. (Your account is temporality blocked for IMAP use. This may happen if you exceed the maximum number of simultaneous IMAP connection allowed. Kindly try after some time.). I have tried after hours, days.

I have setup server imap.zoho.com and port 993, security type SSL/TLS