IMAP on port 143 is refused
Use imap.rcn.com on port 993 with SSL turned on.
RCN Email: Settings, Sign-In & Fixes
RCN is now part of Astound Broadband, which looks after @rcn.com addresses. Astound lists both plain and SSL ports; the SSL ones below are the ones people report working.
Covers @rcn.com. Run by Astound Broadband. Checked against RCN's own help pages, November 2026.
RCN email server settings
| Server | Address | Port | Security |
|---|---|---|---|
| Incoming (IMAP) | imap.rcn.com | 993 | SSL/TLS |
| Incoming (POP) | pop.rcn.com | 995 | SSL/TLS |
| Outgoing (SMTP) | smtp.rcn.com | 587 | STARTTLS; authentication required |
- Username: Your full address, name@rcn.com (the password is case sensitive)
- Use IMAP if you read mail on more than one device; POP downloads mail to one device only.
Official page: RCN email settings
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Common RCN email problems
I can't send from my mail app
Use smtp.rcn.com, port 587, with TLS and "outgoing server requires authentication" turned on.
My login is rejected
Type your full name@rcn.com address as the username, and check capital letters in the password.
Astound's instructions don't match my phone's setup screens
Choose manual setup and type in the server names and ports from this page.
Problems that look the same on every provider
Can't sign in, or the password stopped working
- Sign in on the provider's own webmail page first. If that works, the problem is your mail app, not the account.
- If webmail rejects the password, use the provider's "Forgot password" page. Never use a reset link from an email you did not ask for.
- Many providers now need a separate app password (or their own sign-in screen) for Outlook, Apple Mail and phone apps. Your normal password will not work there.
Not receiving emails
- Check Spam, Junk and any filters or "blocked senders" in webmail.
- Check whether the mailbox is full; most providers stop accepting mail at the storage limit.
- If your app shows nothing new but webmail does, remove and re-add the account in the app using IMAP.
Can't send, or emails are stuck in the Outbox
- Check the outgoing (SMTP) server, port and security on this page against your app; old guides often list ports that no longer work.
- Turn on "My outgoing server requires authentication" and use the same username and password as incoming.
- Large attachments are a common cause. Remove the attachment and try again.
Contacts are getting spam from my address
- Change the password from webmail, then sign out of all other sessions if the provider offers it.
- Check forwarding rules, filters and the reply-to address in settings; attackers often add a hidden forward.
- Turn on two-step verification, and update the password anywhere else you used the same one.
Setting it up on a new phone or computer
- Use IMAP rather than POP so mail stays in sync across your phone, computer and webmail.
- Enter your full email address as the username unless the provider says otherwise.
- If the app offers the provider by name (Yahoo, Google, Outlook), choose that instead of "Other".
Sources: Astound: email and server settings for all markets. Providers change settings from time to time; their own page is the final word.
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