Normal:

Server: smtp.gmail.com
Port: 587 for TLS, 465 for SSL
Username: email address

SMTP Relay:

Server: smtp-relay.gmail.com
Port: 25, 465, or 587 (SSL or TLS)
SMTP relay service section under here.
Add current outside static IP address

Restricted Gmail SMTP server:

Server: aspmx.l.google.com
Port:25 (No encryption)
(Add the following SPF TXT record: @ = v=spf1 ip4:123.45.67.89 include:_spf.google.com ~all)