Setting up "Send AS" in Gmail

Setting up "Send AS" in Gmail

Hi, like ive said in the title, im getting a hard time setting up "Send As" in gmail. ive tried these settings below:

SMTP Server : mail.mydomain.com : 587
Username : mymail@mydomain.com
Password : mypass

TLS

mail.zoho.com : 587
same
same

smtp.mydomain.com : 587
same
same

and others even tried 465 for ssl still cant configure it right.

im guessing this is a zoho mail problem.

anyone got any idea?