Email server settings
Mediacom IMAP settings and SMTP server
The Mediacom IMAP settings are mail.mediacombb.net, port 993 with SSL/TLS. Outgoing mail goes through smtp.mediacombb.net on port 587 with STARTTLS, or port 465 with SSL/TLS if your app has no STARTTLS. The same settings apply to @mediacombb.net and @mchsi.com addresses.
Last checked October 10, 2026, against Mediacom’s own documentation.
Mediacom email servers
| Server, port and securityServer | Port and security |
|---|---|
| IMAP · incomingmail | 993SSL/TLS |
| SMTP · outgoingsmtp | 587STARTTLS |
| SMTP · outgoingsmtp | 465SSL/TLS |
Sign-in: Full email address + email password
User name: your full email address, for example jane.doe@mediacombb.net, for incoming and outgoing mail; the password is your email password.
Mediacom email IMAP and SMTP settings
Mediacom publishes these values in its third-party email settings article on the Mediacom community site: “The settings below are for both @mchsi.com and @mediacombb.net email addresses.”
- IMAP for incoming mail:
mail.mediacombb.net, port 993, SSL/TLS. IMAP is the default account type in Mediacom’s steps; keep it unless you specifically want POP3. The article gives no POP3 server. - SMTP for outgoing mail:
smtp.mediacombb.net, port 587 with STARTTLS. Only if the app can’t do STARTTLS, use port 465 with SSL/TLS. - One login for both servers. The user name, your full address, is used for the incoming and the outgoing connection, so turn on authentication for the outgoing server.
- Webmail: Mediacom’s webmail runs at
https://mail.mediacombb.net(Mediacom webmail). If a mail app fails, first check that you can sign in there.
If the account works and one mail app still fails, Mediacom’s article refers you to “the manufacturer of your email client software”.
User name and password
The user name is your full email address, for example jane.doe@mediacombb.net or jane.doe@mchsi.com, and the password is the password of your email account. Mediacom’s article doesn’t describe app passwords or OAuth sign-in.
Set up Mediacom email on iPhone, Mac and Outlook
iPhone and iPad (menu names from Apple’s current guide):
- Open Settings → Apps → Mail → Mail Accounts and tap Add Account.
- Enter your email address, tap Next, then tap Add Other Account → Mail Account.
- Enter your name, full email address, email password and a description, tap Next and wait while Mail verifies the account, then save it.
- If Mail asks for servers, enter
mail.mediacombb.net(incoming) andsmtp.mediacombb.net(outgoing) with your full address as the user name, and the ports from the table.
Mac Mail: open System Settings (System Preferences on older macOS) → Internet Accounts, choose Add Other Account and then Mail account. Enter your name and address and click Sign In, then the user name (your full address, used for incoming and outgoing mail), your email password, mail.mediacombb.net as the incoming and smtp.mediacombb.net as the outgoing server. Leave the account type on IMAP.
Outlook on Windows: add the account, open Advanced options and set it up manually, select IMAP, enter the servers and ports from the table, then your email password, and click Connect. Outlook sends a test message to check the account.
Thunderbird and Android apps: the same values work in any IMAP app: IMAP 993 SSL/TLS, SMTP 587 STARTTLS (or 465 SSL/TLS), full address as user name.
Common Mediacom email problems
| Error or symptom | Fix |
|---|---|
| Receiving works, sending fails | Turn on authentication for the outgoing server with the same login, and match port and security: 587 with STARTTLS, or 465 with SSL/TLS. |
| Login rejected | Enter the whole address as the user name, including @mediacombb.net or @mchsi.com, and check the password in webmail. |
| “Server not responding” or the connection times out | Check the spelling of mail and smtp and the port numbers, and make sure SSL/TLS is on for 993. |
| Webmail works, one app still fails | Mediacom refers problems with a single mail app to the maker of that app. |
Bounces from other servers carry a reply code; the SMTP error codes reference explains them.
Is @mediacombb.net a valid email domain?
Yes. Mediacom email addresses end in @mediacombb.net or @mchsi.com, and Mediacom’s settings article covers both. A valid domain is still no proof that one mailbox exists: an address that worked years ago may have been closed since, and mail to it then hard bounces.
Check one contact with is this a real email address, or clean an older list with the bulk email verifier before you send to it; that keeps your email bounce rate low.
Sources
Checked on October 10, 2026. Server names and ports come from Mediacom’s articles on its own support community site:
Other internet providers
Mediacom email settings: FAQ
What are the Mediacom IMAP settings?
mail.mediacombb.net, port 993, SSL/TLS. User name: your full email address; password: your email password.What is the Mediacom SMTP server?
smtp.mediacombb.net on port 587 with STARTTLS, or port 465 with SSL/TLS if your app doesn’t offer STARTTLS. Log in with the same address and password.Are mchsi.com and mediacombb.net settings the same?
@mchsi.com and @mediacombb.net addresses.Does Mediacom support POP3?
Email validation API
Validate mediacombb.net addresses before you send
emailvalidation.io checks syntax, MX records and the mailbox over SMTP, flags disposable, role and free addresses and returns a quality score, in one request.
/v1/info Email validation API Read the documentation
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GET https://api.emailvalidation.io/v1/info?
{
"email": "support@emailvalidation.io",
"user": "support",
"tag": "",
"domain": "emailvalidation.io",
"format_valid": true,
"mx_found": true,
"smtp_check": true,
"catch_all": null,
"role": true,
"disposable": false,
"free": false,
"score": 0.64,
"state": "deliverable",
"reason": "valid_mailbox",
"did_you_mean": ""
}