Go and allow

1- https://myaccount.google.com/lesssecureapps

Incoming Mail (IMAP) Server

imap.gmail.com

Requires SSL: Yes

Port: 993 port pop3 995
Outgoing Mail (SMTP) Server

smtp.gmail.com

Requires SSL: Yes

Requires TLS: Yes (if available)

Requires Authentication: Yes

Port for SSL: 465

Port for TLS/STARTTLS: 587
Full Name or Display Name Your name
Account Name, User name, or Email address Your full email address
Password Your Gmail password