SMTP is the protocol that is used. It is known as Simple Mail Transfer Protocol. All the mails are sent via this procedure.
How many megabytes does gmail mail allow for attachmentsRead more: How_many_megabytes_does_gmail_mail_allow_for_attachments
HTTPS
You can send exe file through attachment on Gmail. Exe files are executable files in windows. They can be used to install a program or use stuff inside it.
SMTP (send mail transfer protocol)
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.
Adding a picture can be in an attachment or in Google Drive. The pin icon can be used to add attachment. The picture icon can be used for Drive.
File transfer protocol
Gmail does not provide any games. Instead it is used for mailing purpose only. It ca be used to send and receive mails.
You cannot send SMS through Gmail Mobile. There are other ways to show a notification. It is the hangouts that can be used for that.
Gmail uses the technology or the protocols to send mails. It works on port number 487 for SSL. IMAP and SMTP are the protocols used.
Here are some very important protocols related to email marketing;IMAP(Internet Message Access Protocol) - is server based protocol - send and receiving but email remains on the server and is not downloaded to your computer unless u ask.POP3(Post office protocol) is a receiving protocol, not for sending.SMTP(Simple mail transfer Protocol) is a send protocol not for receivingHTML is a document formatting protocol typically used in web pages - most email protocols r html aware but it in itself is not a send protocol.
Here are some very important protocols related to email marketing;IMAP(Internet Message Access Protocol) - is server based protocol - send and receiving but email remains on the server and is not downloaded to your computer unless u ask.POP3(Post office protocol) is a receiving protocol, not for sending.SMTP(Simple mail transfer Protocol) is a send protocol not for receivingHTML is a document formatting protocol typically used in web pages - most email protocols r html aware but it in itself is not a send protocol.