SMTP is an abbreviation of Simple Mail Transfer Protocol, which is a protocol for sending e-mail messages between servers. Basically, SMTP is an outgoing mail server and for this the port number should be 587. You should change the specific POP server settings for Roadrunner emails to properly transferring electronic mail on server. Set the SMTP Server For Roadrunner Email as roadrunner.com. Contact to educated and highly experienced technicians for additional support. Simply give an instant ring at +1-855-258-6664 helpline number by sitting at your home and make connection with extra-ordinary executive.