Glossary:SMTP
If you manage your email using a program or app on your own device (rather than using webmail) then SMTP or Simple Mail Transfer Protocol is the method by which your program or app submits outgoing email to a mail server.
If you manage your email using a program or app on your own device (rather than using webmail) then SMTP or Simple Mail Transfer Protocol is the method by which your program or app submits outgoing email to a mail server.