"Verification Failed" Error in Mail as well as Airmail (Mac)

"Verification Failed" Error in Mail as well as Airmail (Mac)

I just setup my email on my own domain in ZOHO Mail.

I am using Airmail on Mac. However, Airmail is unable to authenticate my email account. I tried POP as well IMAP

Then I tried configuring mail on Mac's Mail. But there too I get error, Verification Failed. 

I am a seasoned user. So checked all Password, Server Settings, Ports etc. They are all as they should be


Please help!!!