IMAP and SMTP use the standard Simple Authentication and Security Layer (SASL), via the native IMAP AUTHENTICATE and SMTP AUTHcommands, to authenticate users. The SASL XOAUTH2 mechanism enables clients to provide OAuth 2.0 credentials for authentication. The SASL XOAUTH2 protocol documentation describes the SASL XOAUTH2 mechanism in great detail, and libraries and samples which have implemented the protocol are available.
HTTPS
SMTP is the protocol that is used. It is known as Simple Mail Transfer Protocol. All the mails are sent via this procedure.
Pop Office Protocol
Allows your email(s) from Gmail (or other free email services) to be forwarded to another email address such as Outlook - internal company email etc.
Most email programs that use individual clients use POP (Post office protocol). Web based programs like Yahoo and Gmail use http protocol.
Google uses IMAP protocol for email. It is because of better security settings. Gmail has tried to improve it's security settings everyday.
anybody, no somebody, yes is it easy? no is it possible? yes is it worth it? not really you can protect yourself by using gmail over HTTPS (SSL) protocol
SMTP stands for Simple Mail Transfer Protocol. This is the generally accepted protocol for sending e-mail messages between servers; most e-mail systems that send mail over the Internet use SMTP to send messages from one server to another; the messages can then be retrieved with an e-mail client using either POP or IMAP.
eMail is sent and received using different protocols. There is an error in the settings in your eMail application (e.g. Outlook) for the receive protocol used by Gmail. Find and correct this error and you will be able to both send and receive.
The first protocol that was used by the APARNET was called the Internet Protocol.
Gmail can be used to get Emails mainly. It can also be used to get messages from hangouts. It is a complete networking service.
You can talk on chat using Gmail. Gmail has an instant messaging service in it too. It is called as Hangouts.