What Port Does Roadrunner Email Use for Outgoing Mail?
Short question, short answer, then the why. The outgoing port is where most “it will not send” problems live.
Quick answer: Roadrunner email uses the outgoing mail server port 587 on mobile.charter.net, with SSL/TLS on and authentication required. Port 465 with SSL works in some apps too.
Why not port 25?
Port 25 is the original outgoing port, from before authentication was standard. Networks block it to stop spam, so mail you send over 25 quietly stalls. Switch to 587, which expects a proper login, and messages flow.
Whenever someone tells me their Roadrunner mail “stopped sending for no reason”, the first thing I check is that port. More often than not an update or a new app reset it to 25. Reset it to 587. Fixed.
If 587 still fails
- Try port 465 with SSL, which a few clients prefer.
- Confirm authentication is on and using your full address.
- Reset the password at Spectrum if the login itself is being rejected.
For account level things like resets and recovery, go straight to Spectrum. Bookmark the Spectrum webmail page and keep the settings reference handy.
Questions people ask
Is port 25 ever used for Roadrunner outgoing mail?
No. Networks block it. Use 587 with authentication, or 465 if your app prefers it.
What encryption goes with port 587?
SSL/TLS, turned on. Pair 587 with SSL and authentication and outgoing mail flows.
Can I leave the outgoing port on whatever my app chose?
Only if it chose 587 or 465. If it defaulted to 25, change it. Port 25 is blocked on most networks and your mail just stalls in the outbox.
So the port is the thing to get right. Use 587. SSL on. If an app resists, 465 is the backup, and the rest of your outgoing mail falls into place.