I have a Gmail account set up in Zoho that I've used for a couple of years. Recently, I can't seem to send any messages through this account though it is recieving messages. I double checked that the username/pwd are the same in the Gmail account as in the config within Zoho and they are the same. I attempted to look at the outgoing port but can't seem to find it.

 

How can I resolve the following error?

 

Unable to connect SMTP server:smtp.gmail.com Reason:Authentication failed:535-5.7.1 Username and Password not accepted. Learn more at535 5.7.1 http://support.google.com/mail/bin/answer.py?answer=14257 sb3sm40856284pbc.44 

 

I have checked the URL and followed their guidance but it didn't solve anything.