Free Open SMTP Relay | Easy Setup Email Service | Mailgun
www.mailgun.com › free-open-smtp-relayYou simply route your outgoing email to a professionally managed SMTP server, and that third-party sends those outgoing emails on your behalf. Open relay means the SMTP server is routing both messages from external sources and internal server mail, while closed relay only routes messages generated on the internal network or server. By its nature, open mail relay is more expansive, but it can also be more vulnerable to spam abuse. With SMTP relay, your personal email address like your gmail ...
SMTP - SMTP Open Relay - MxToolbox
mxtoolbox.com › problem › smtpSMTP Open Relay More Information About Smtp Open Relay During our diagnostics we attempt to simulate sending a message to a fake email address; test@example.com. We do this to try to detect if your server is an open relay, which means that it accepts mail to domains for which it is not responsible and then passes it along to the proper server.