I've just created my account 3 hours ago and i can't test SMTP and POP3 accounts for my organization. (two factor is disabled)
so i tried to do a simple configuration in my outlook account for POP and SMTP with the configuration below:
POP
Incoming Server Name : poppro.zoho.com
Port : 995
Require SSL : Yes
Outgoing / SMTP
Outgoing Server Name: smtp.zoho.com
Port : 465 with SSL or 587 with TLS
Require Authentication: Yes
Outlook always return error.
15:43:06,010 INFO [stdout] (default task-11) DEBUG SMTP: connected to host "smtp.zoho.com", port: 465
15:43:06,011 INFO [stdout] (default task-11)
15:43:06,016 INFO [stdout] (default task-11) EHLO DESKTOP-GRGAHA3
15:43:06,321 INFO [stdout] (default task-11) 250-mx.zohomail.com Hello DESKTOP-GRGAHA3 (189.122.99.131 (189.122.99.131))
15:43:06,325 INFO [stdout] (default task-11) 250-AUTH LOGIN PLAIN
15:43:06,330 INFO [stdout] (default task-11) 250 SIZE 22020096
15:43:06,335 INFO [stdout] (default task-11) DEBUG SMTP: Found extension "AUTH", arg "LOGIN PLAIN"
15:43:06,340 INFO [stdout] (default task-11) DEBUG SMTP: Found extension "SIZE", arg "22020096"
15:43:06,345 INFO [stdout] (default task-11) DEBUG SMTP: Attempt to authenticate using mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM XOAUTH2
15:43:06,350 INFO [stdout] (default task-11) DEBUG SMTP: Using mechanism LOGIN
15:43:06,355 INFO [stdout] (default task-11) DEBUG SMTP: AUTH LOGIN command trace suppressed
15:43:06,822 INFO [stdout] (default task-11) DEBUG SMTP: AUTH LOGIN failed