iPhone 17 Pro Xfinity Email Not Accepting Account (IMAP Error): Causes and Fixes

You type your Xfinity or Comcast email and password into your new iPhone 17 Pro. The password is right, because you can sign in on the website. But Mail keeps saying “Password Incorrect, enter the password for the IMAP account” or “Cannot Get Mail: the mail server imap.comcast.net is not responding.”

Here is the good news: the iPhone 17 Pro itself is almost never the problem. The same errors show up on older iPhones too. In nearly every case, the cause is one of a handful of account-side issues. This guide walks through them in the order most likely to fix your problem, with the exact settings.

First, a quick diagnosis: which error are you seeing?

Cause 1: Third Party Access Security is switched off

This is the most common reason Xfinity email is rejected by Apple Mail or any other app. Xfinity added a security checkbox to its email website that controls whether outside apps can connect at all. If the box is unchecked, even the correct password will be refused.

Here is how to check it:

1. On a computer or in your iPhone’s browser, sign in to Xfinity Email with your Xfinity ID and password.
2. Open the gear icon, then Email Settings.
3. Tap Security.
4. Make sure Third Party Access Security is checked, then save. [You can see official guide]

Already checked? Toggle it anyway. Several people on the Xfinity Community forum report that switching the box off, saving, then switching it back on fixed an error that persisted even though the box looked ticked. After that, close the Mail app fully before you try again.

Cause 2: Your mailbox has moved to Yahoo Mail

This is the cause most older guides miss, and it matters in 2026. Xfinity began moving comcast.net mailboxes to Yahoo Mail in June 2025, in phases through 2026. Your address stays the same, but the servers behind it change.

According to Xfinity’s own support page on Yahoo Mail migration, if you use a third-party app such as iOS Mail or Outlook, you need to re-add your account using the Yahoo Mail settings. Once you accept Yahoo’s terms, you can only reach the mailbox through Yahoo’s platform, and the old Comcast servers no longer work for you. An app still pointed at imap.comcast.net after that point will throw errors.

How to tell if you have moved:

• You accepted Yahoo’s terms of service when prompted, or you now sign in at a Yahoo page.
• You received an invitation by email or after signing in to Xfinity Connect.
• Your Xfinity Email website now shows Yahoo.

If you have not accepted the Yahoo upgrade, you can keep using the Xfinity Email platform and the Comcast settings below.

The correct settings for both situations

If your mailbox is still on Xfinity (Comcast servers)

Xfinity staff have said in the community forum that Xfinity Email does not have a separate IMAP password. It always uses your Xfinity ID password. You may see websites telling you to create an “app-specific password” for Comcast. I could not find that in Xfinity’s own guidance, so for an account still on Xfinity, start with your normal Xfinity ID password.

If your mailbox has moved to Yahoo

Yahoo’s help page lists “Generate App Password” as the login method for third-party apps, so a regular password may be rejected. Create the app password in your Yahoo account’s security settings, then paste it into Mail. Alternatively, choose Yahoo from the account list when adding the account on the iPhone and follow the sign-in prompts.

Step-by-step: remove the account and add it again properly

This clean reset fixes more cases than anything else, and several forum users say it was the step that finally worked. Deleting an IMAP account from your iPhone removes the local copy only. Your messages stay on the server.

1. Delete the old account

1. Open Settings > Apps > Mail > Mail Accounts (on iOS 26, which the iPhone 17 Pro ships with).
2. Tap your Comcast or Xfinity account.
3. Tap Delete Account and confirm.

2. Fix the account side first

Before you re-add it, confirm Third Party Access Security is on (Cause 1), or generate your Yahoo app password if you have moved (Cause 2).

3. Add it again

1. Go back to Mail Accounts > Add Account.
2. Choose Other, then Add Mail Account. (For a Yahoo-migrated mailbox you can choose Yahoo instead.)
3. Enter your name, full email address, password, and a description.
4. If Mail asks you to pick IMAP or POP, choose IMAP, then enter the server details from the tables above.

iOS 26 quirk: the IMAP choice does not appear

Some people report that after updating to iOS 26, the IMAP/POP selection does not show up during setup. A workaround shared in Xfinity’s community forum is to enter the wrong password on purpose. Mail shows an error, then offers the manual IMAP and POP screens. Pick IMAP, then enter the correct password and server details. This is a user report, not an official Apple or Xfinity step, so treat it as a fallback.

If you want a second walkthrough of the manual IMAP fields, this guide to Comcast IMAP settings on iPhone covers the same setup on an earlier model, and the steps match.

Cause 3: A password change that did not reach the iPhone

If the error began right after you changed your Xfinity password (or were forced to reset it), the iPhone is probably still holding the old one. Remember that iOS stores the password in two separate places: one for the incoming server and one for the outgoing SMTP server. Update both:

1. Go to Settings > Apps > Mail > Mail Accounts, tap the account, and update the password under the account.
2. Scroll to Outgoing Mail Server, tap smtp.comcast.net, and update the password there too.

Other apps on your phone, such as Outlook or Gmail with the same mailbox, also need the new password.

Cause 4: A connection problem that looks like a password problem

Apple Mail is not always specific about what failed. “Password incorrect” can pop up even when the real issue is that the server connection did not complete. One user on the Xfinity forum noted that a third-party app showed a clearer error than Apple’s Mail app, which had only said the password was wrong. Try these:

• Turn off any VPN and test again. At least one forum user reported this helped.
• Switch between Wi-Fi and cellular data to see if one network blocks the connection.
• Restart your iPhone and force-close Mail.
• Update iOS in Settings > General > Software Update.
• Check the username format. Use the full address with @comcast.net. One older forum thread described a case where removing and re-typing the username forced a fresh password prompt that cleared the error.
• Last resort: Reset Network Settings under Settings > General > Transfer or Reset iPhone > Reset. This erases saved Wi-Fi passwords and VPN settings.

An Xfinity staff reply in one thread also noted that Apple Mail can stop syncing if the secure connection between the phone and the server becomes invalid, even when the password has not changed. Deleting and re-adding the account (above) is the fix for that. For iOS 26-specific Mail setup, Apple’s official guide shows the Settings > Apps > Mail path: Apple Support: Change Mail settings on iPhone.

You can receive email but not send it

If incoming mail works but outgoing fails, the problem is almost always the SMTP server entry, not IMAP. Check these in Settings > Apps > Mail > Mail Accounts > your account > Outgoing Mail Server > the SMTP server:

• Host name: smtp.comcast.net (or smtp.mail.yahoo.com if migrated)
• Use SSL: on
• Port: 587 (or 465)
• Authentication: Password, with your full email address and password filled in

If the settings look right and messages still bounce or sit in the Outbox, our walkthrough on what to do when Comcast email is not sending goes deeper into the usual outgoing-server causes.

Email connects, but folders are missing or messages stop arriving

Some people finish setup, see the inbox, and then notice missing folders or no new mail. If you recently moved to Yahoo, a few users report that custom folders did not appear in Apple Mail until the account was deleted and added again. Check that the account is set to IMAP, not POP. One forum user noticed iPhone had defaulted to POP and only found the IMAP tab by deleting and re-adding the account. If the inbox itself is stuck, see this help page on Comcast email not receiving messages.

What if nothing works?

• Use the web or the official app for now. You can still read your mail at Xfinity Email in Safari, or in the Yahoo Mail app if you moved. Several forum users say webmail works while Mail on iPhone does not.
• Remember Xfinity’s support limits. Staff say they cannot support third-party email apps, only their own email platform. If Apple Mail is the problem, Apple Support may be a better first stop.
• Try a different app. If Outlook or Gmail connects but Apple Mail does not, the issue is with the Mail app’s stored state, not your account.

For broader checks, including outages and mailbox problems that are not specific to iPhone, you can also read this guide to resolving Comcast email that is not working.

Does iPhone 17 Pro make any difference?

Not in any way that I could find. Search results and forum threads show the same IMAP password and “server not responding” messages on iPhone 16, iPhone SE and older devices. What the iPhone 17 Pro changes is the software: it comes with iOS 26, where menus are under Settings > Apps > Mail and some people report the IMAP choice appearing late. Hardware is not the cause, so replacing or resetting the whole phone is unnecessary.

Frequently asked questions

Why is my Xfinity email not working on my iPhone 17 Pro?

The two most common reasons are that Third Party Access Security is off in your Xfinity email settings, or that your mailbox has moved to Yahoo and Mail is still pointing at the old Comcast servers.

Why does my iPhone keep asking for my IMAP password?

The server is rejecting the saved login. Causes include a changed password, third-party access being off, a migrated mailbox, or an expired secure connection. Delete the account and add it again after checking the account side.

What are the Xfinity IMAP settings for iPhone?

Incoming: imap.comcast.net, port 993, SSL on. Outgoing: smtp.comcast.net, port 587 (or 465), SSL on, authentication required. Username is your full email address.

What port does Xfinity IMAP use?

Port 993 with SSL. For outgoing mail, 587 is the most commonly recommended port.

Do I need an app password for Xfinity email?

For a mailbox still on Xfinity, Xfinity staff say there is no separate IMAP password and your Xfinity ID password is used. For a mailbox that moved to Yahoo, Yahoo’s help page directs third-party apps to use a generated app password.

What is Third Party Access Security?

It is a checkbox in Xfinity Email’s Security settings that lets outside email apps such as Apple Mail and Outlook connect to your mailbox.

Will deleting the account delete my emails?

For an IMAP account, no. Removing it from the iPhone deletes only the copy on the phone. Your messages stay on the mail server. Avoid using POP if you want everything to stay synced.

The short version

When Xfinity email will not connect to your iPhone 17 Pro, check the account before you blame the phone. First confirm Third Party Access Security is on. Then find out whether your mailbox has moved to Yahoo, and use the matching server settings and password type. Update the password in both the incoming and outgoing entries, turn off any VPN, and delete and re-add the account with the right details. Those steps solve the vast majority of cases.