Roadrunner SMTP Settings

Configure your outgoing mail server for sending emails

Roadrunner SMTP Server Settings

SMTP (Simple Mail Transfer Protocol) settings are required to send emails from your Roadrunner account through email clients like Outlook, Thunderbird, or mobile devices.

Primary SMTP Settings

Setting Value
SMTP Server mobile.charter.net
SMTP Port 587 (TLS) or 465 (SSL)
Security Type STARTTLS or SSL/TLS
Authentication Required - Use your full email address and password
Username Your full Roadrunner email address (username@roadrunner.com)
Password Your Roadrunner email password

Alternative SMTP Settings

If the primary settings don't work, try these alternatives:

Server Type SMTP Server Port Security
Spectrum/Current mobile.charter.net 587 STARTTLS
Original Roadrunner smtp-server.roadrunner.com 465 SSL
TWC (Legacy) smtp.twc.com 587 TLS
Alternative mail.roadrunner.com 25 None

SMTP Configuration by Device

iPhone/iPad SMTP Setup

  1. Go to Settings → Mail → Accounts
  2. Select your Roadrunner account
  3. Tap "Account" → "SMTP" under Outgoing Mail Server
  4. Tap "Primary Server"
  5. Enter:
    • Server: mobile.charter.net
    • Port: 587
    • Security: STARTTLS
    • Authentication: Password
  6. Tap "Done" to save

Android SMTP Configuration

  1. Open Email app → Settings → Your Roadrunner account
  2. Tap "Outgoing Server" or "SMTP"
  3. Enter SMTP server: mobile.charter.net
  4. Set port to 587
  5. Enable "Require sign-in" or "Authentication"
  6. Enter your full email and password
  7. Set security type to "TLS" or "STARTTLS"

Microsoft Outlook SMTP Setup

  1. Open Outlook → File → Account Settings
  2. Select your Roadrunner account → Change
  3. Click "More Settings" → "Outgoing Server"
  4. Check "My outgoing server requires authentication"
  5. Select "Use same settings as my incoming mail server"
  6. Go to "Advanced" tab
  7. Set SMTP port to 587 and encryption to TLS
  8. Click OK → Next → Finish

Common SMTP Issues and Solutions

"Cannot Send Mail" Error

  • Check Authentication: Ensure "Require Authentication" is enabled
  • Verify Password: Your email password is correct
  • Port Settings: Try port 587 instead of 465
  • Network Connection: Check your internet connection

SMTP Server Not Responding

  • Try using "mail.twc.com" as SMTP server
  • Switch between ports 587, 465, and 25
  • Disable VPN temporarily
  • Check if your ISP blocks port 25 (use 587 instead)

Authentication Failed

  • Use full email address as username (including @roadrunner.com)
  • Reset your password if recently changed
  • Check if account is locked due to multiple failed attempts
  • Wait 15-30 minutes and try again

Email Sending Slowly

  • Check your internet connection speed
  • Reduce attachment sizes (max 25MB)
  • Try using a different SMTP port
  • Contact your ISP about throttling

Important SMTP Notes:

  • SMTP authentication is MANDATORY for sending emails
  • Use your full email address as the username
  • Some networks may block port 25; use port 587 as an alternative
  • If using Spectrum internet, SMTP should work without additional settings
  • For Spectrum Business accounts, settings may differ

Testing Your SMTP Configuration

After configuring SMTP settings, test them by:

  1. Sending a test email to yourself
  2. Checking the "Sent" folder to confirm delivery
  3. Sending an email to another account (Gmail, Yahoo, etc.)
  4. Checking for bounce-back error messages

Alternative: Use Webmail for Sending

If SMTP configuration continues to fail, you can always use Roadrunner Webmail to send emails from any browser without needing SMTP settings.

Still Having Issues?

If you've tried all these settings and still can't send emails: