IMAP/EMAIL problems! Cannot set up emails on SAMUSUNG Galaxy S3

IMAP/EMAIL problems! Cannot set up emails on SAMUSUNG Galaxy S3

I cannot set up zoho mail on my samsung galaxy S3. I've followed all the instructions correctly on zoho but constantly get 'authentication failed. This is frustrating to no end as need to have full access to emails for business whilst on the go. Have emailed zoho support constantly. Nothing. Very frustrating. Can anyone help? Thanks :)