Comcast Xfinity SMTP Settings
Comcast's Xfinity home internet email, on comcast.net addresses.
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Outgoing mail (SMTP)
SMTP server
smtp.comcast.net
Port. STARTTLS
587
Port. SSL/TLS
465
Security
STARTTLS on 587 (recommended) or SSL/TLS on 465. Comcast blocks port 25 outbound.
Incoming mail (IMAP)
IMAP server
imap.comcast.net
Port. SSL/TLS
993
Incoming mail (POP3)
POP3 server
pop3.comcast.net
Port. SSL/TLS
995
Sending limits & login
Daily send limit
About 1,000 recipients per day per account.
Authentication
Third-party access is off by default: switch on Third Party Access Security at connect.xfinity.com under Settings > Security first.
App password
No app password while the mailbox is still on Comcast. Once it moves to Yahoo, mail apps need a Yahoo app password instead of your Xfinity password.
Comcast is moving comcast.net mailboxes to Yahoo Mail in stages through 2026, so which settings you need depends on whether yours has moved. If your webmail now loads Yahoo, use imap.mail.yahoo.com (993), pop.mail.yahoo.com (995) and smtp.mail.yahoo.com (465 or 587) with a Yahoo app password. If you still sign in at connect.xfinity.com, the servers above are the right ones. Comcast blocks outbound port 25 either way.
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Comcast Xfinity SMTP, IMAP and POP3 settings
Comcast provides email at comcast.net as part of Xfinity home internet, and Comcast is now moving those mailboxes to Yahoo Mail in waves that began in June 2025. Until your address is moved, no mail app can connect unless you tick a box called Third Party Access Security inside Xfinity Email on the web, because Comcast keeps that switch off for accounts that have never used an outside client, and Comcast refuses port 25 outright so outgoing mail has to go over 587 or 465. Once your address has moved, the Comcast servers below stop working and the mailbox is set up as a Yahoo account instead.
For incoming mail, use the IMAP server imap.comcast.net on port 993, or POP3 at pop3.comcast.net on port 995. Pick the exact values from the tool above and copy them straight into your mail client.
Checked against Comcast Xfinity's own documentation: xfinity.com. Ports and limits change, so check there too if something will not connect.
Comcast Xfinity settings at a glance
One card with every server and port on it. Right click to save it, or share the page and this is the preview people see.
What to enter as your Comcast Xfinity username and password
Wrong credentials, not a wrong port, are the usual reason a Comcast Xfinity connection fails. These are the exact values to type.
Your full Comcast email address, for example name@comcast.net
Your Xfinity ID password while the mailbox is still on Comcast's own servers. Once Comcast moves the address to Yahoo Mail, mail apps need a Yahoo app password generated from the Yahoo account security page instead.
How to set up Comcast Xfinity in a mail client
The exact path through Comcast Xfinity's own settings, in order.
- 1
Turn on third-party access first
Sign in at https://connect.xfinity.com, click the gear icon at the top right, choose Settings, then Security, and tick the box under Third Party Access Security.
- 2
Add the account as IMAP, not POP
Comcast recommends IMAP so folders stay in sync across devices. Incoming server is imap.comcast.net on port 993 with SSL on.
- 3
Set the outgoing server
smtp.comcast.net on port 587 with TLS, or port 465 with SSL if your app offers nothing else. Port 25 will not connect.
- 4
Use the whole address as the username
Type the full comcast.net address rather than the part before the @, and use your Xfinity ID password.
- 5
Send a test message
If receiving works but sending fails, go back to Settings then Security in Xfinity Email and confirm the Third Party Access Security box is still ticked.
- 6
If Comcast has already moved you to Yahoo, use Yahoo's servers instead
A migrated comcast.net address signs in at login.yahoo.com and needs imap.mail.yahoo.com on port 993 with SSL, and smtp.mail.yahoo.com on port 465 or 587, with a Yahoo app password rather than your Xfinity password.
What Comcast Xfinity looks like filled in
Every mail client asks for the same handful of fields. Here they are with Comcast Xfinity's values already in place.
Account settings: Comcast Xfinity
Server
smtp.comcast.netPort
587Encryption
STARTTLSAuthentication
RequiredUsername
Your full Comcast email address, for example name@comcast.netPassword
Your Xfinity ID password while the mailbox is still on Comcast's own servers. Once Comcast moves the address to Yahoo Mail, mail apps need a Yahoo app password generated from the Yahoo account security page instead.Server
imap.comcast.netPort
993Encryption
SSL/TLSAn illustration of the fields, not a screenshot of any one app. Field names differ slightly between Outlook, Apple Mail and Thunderbird; the values do not.
Comcast Xfinity SMTP settings in Thunderbird
The outgoing server dialog with Comcast Xfinity's details entered. Outlook and Apple Mail ask for the same four things under slightly different names.
Which port should you use for Comcast Xfinity?
STARTTLS on 587 (recommended) or SSL/TLS on 465. Comcast blocks port 25 outbound.
STARTTLS
Starts as a plain connection, then upgrades to an encrypted one. The modern standard for sending.
SSL/TLS
Encrypted from the first byte. Widely supported and a good choice when 587 is blocked.
Plain SMTP
Meant for server-to-server relay. Home networks and cloud hosts block it, so do not use it to send from a client.
Why your Comcast Xfinity connection is failing
The failures people actually hit with Comcast Xfinity, and what fixes each one.
Sign in at connect.xfinity.com, open the gear icon, then Settings, then Security, and tick Third Party Access Security. Comcast leaves that setting off for accounts that have never used an outside mail app.
Comcast is moving comcast.net mailboxes to Yahoo Mail. After the move, point the app at imap.mail.yahoo.com port 993 and smtp.mail.yahoo.com port 465 or 587, sign in once at login.yahoo.com, and generate a Yahoo app password for the app.
Comcast does not support port 25 for sending mail on residential internet. Change the outgoing port to 587 with TLS, or 465 with SSL.
Comcast dropped unencrypted port 110. Use POP on pop3.comcast.net port 995 with SSL, or move the account to IMAP on imap.comcast.net port 993.
Comcast only keeps email for people who leave if they signed in on the Xfinity Email website in the 90 days before disconnecting, and they must keep signing in on that website at least once every nine months. Checking mail through IMAP alone does not count.
Comcast blocks an account from sending for the rest of the day once it passes 1,000 recipients in 24 hours. Split large sends across days or use a proper bulk sender.
Comcast Xfinity sending limits
Comcast counts recipients rather than messages, and the mailbox itself stops accepting new mail once it reaches 10 GB of storage.
Per day
1,000 recipients per day
Recipients per message
100 recipients per message
Max attachment
25 MB total message size, including headers and formatting
Sending cold email through Comcast Xfinity
About 1,000 recipients per day per account. Third-party access is off by default: switch on Third Party Access Security at connect.xfinity.com under Settings > Security first.
Those caps make single-mailbox sending fine for personal mail but a poor fit for cold outreach at volume. Emailchaser spreads sending across warmed inboxes and manages deliverability, so you can scale without burning Comcast Xfinity accounts.
Other internet provider (isp) email
Setting up more than one mailbox? These sit in the same category as Comcast Xfinity.
Common questions about Comcast Xfinity SMTP settings
What are Comcast Xfinity's SMTP settings?
Comcast Xfinity's outgoing (SMTP) server is smtp.comcast.net. Use port 587 (STARTTLS) or 465 (SSL/TLS). STARTTLS on 587 (recommended) or SSL/TLS on 465. Comcast blocks port 25 outbound. Sign in with your full email address and password (or app password).
What is Comcast Xfinity's IMAP or POP3 server?
Comcast Xfinity's incoming IMAP server is imap.comcast.net on port 993 (SSL/TLS). If you prefer POP3, use pop3.comcast.net on port 995.
Which port should I use for Comcast Xfinity?
Use port 587 with STARTTLS wherever it's offered, it's the modern standard for authenticated sending. Port 465 with SSL/TLS is a solid alternative. Avoid port 25, which most networks block for client sending. Comcast Xfinity's recommended value is above.
Why won't my Comcast Xfinity SMTP connection work?
Check authentication first: Third-party access is off by default: switch on Third Party Access Security at connect.xfinity.com under Settings > Security first. No app password while the mailbox is still on Comcast. Once it moves to Yahoo, mail apps need a Yahoo app password instead of your Xfinity password. Then confirm the host, port and security method match exactly, a 587/SSL or 465/STARTTLS mismatch will fail to connect.
Can I send bulk or cold email through Comcast Xfinity?
Not at scale. About 1,000 recipients per day per account. Providers throttle bursts to fight spam, so pushing cold email through one mailbox hits limits and wrecks deliverability. High-volume outreach belongs on dedicated infrastructure that spreads sending across warmed inboxes, which is what Emailchaser does.
Can I keep my comcast.net address after I cancel Xfinity?
Only if you signed in on the Xfinity Email website in the 90 days before your service ended. After that, you have to sign in on that website at least once every nine months to keep the account alive. Reading mail in Outlook or Apple Mail does not satisfy the rule.
Why does Comcast refuse port 25?
Comcast stopped supporting port 25 for sending because infected home machines used it to push out spam for years. Use port 587 with TLS, or 465 with SSL, when sending through smtp.comcast.net.
Does Comcast offer app passwords like Gmail does?
Not on Comcast's own mail servers. While the mailbox is still on comcast.net infrastructure your app uses the same password as your Xfinity ID, which is why the Third Party Access Security checkbox exists, and a password change means updating every mail app by hand. Once Comcast moves the address to Yahoo Mail you do get app passwords, generated from the Yahoo account security page.
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