I am unable to send emails on Apple Mail from five Comcast Xfinity accounts on both my iMac and iPhone.

I understand how frustrating it is to be unable to send emails from your Comcast Xfinity accounts in Apple Mail. I've seen this issue arise before, and here are some additional suggestions you can try:

Double-check Mail settings:

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• Port settings: Verify that the outgoing server port is set to 587 for both IMAP and SMTP. For IMAP, the incoming server port should be 993 (SSL) or 143 (without SSL).
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• Authentication: Ensure both accounts are set to "Always Use SSL" or "STARTTLS" for connection security.
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• Username and password: Double-check that you're using the full email address for the username and the correct password you use for accessing Comcast Xfinity webmail.
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• App Password: Comcast recently implemented "Third-party application access security," requiring a separate app password for third-party applications like Apple Mail. Generate an app password from your Xfinity webmail settings and try using that instead of your regular password.
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Additional troubleshooting:

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• Reset network settings: On your Mac, go to System Preferences > Network > Advanced > TCP/IP > Renew DHCP Lease. On your iPhone, go to Settings > General > Reset > Reset Network Settings.
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• Update software: Ensure you're running the latest updates for Apple Mail on both your Mac and iPhone. Also, check for any available updates for your iOS and macOS system software.
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• Disable third-party email filtering: Sometimes third-party email filtering services can interfere with sending emails. Temporarily disable any such services you might be using.
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• Check Comcast Xfinity status: Visit Xfinity's website or outage map to see if there are any ongoing email server issues in your area.
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Reach out to Comcast again:

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• Explain the steps you've already taken and provide any error messages you're encountering.
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• Request to be escalated to a higher level of technical support.
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• Mention that other users have reported similar issues and suggest they investigate any potential service-wide problems.
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Consider alternative solutions:

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• While troubleshooting, you can use the webmail interface on your computer or phone to access your Comcast Xfinity emails and send messages temporarily.
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• As a last resort, you can try setting up your Comcast Xfinity accounts in a different email client like Outlook or Thunderbird.
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I hope these suggestions help you resolve the issue. If you've tried all of these steps and are still unable to send emails, keep pushing for a solution from Comcast support.

By chance do you have ANY of the following types of third party apps installed on the computer:

• Antivirus app
• Security app
• Cleaning app
• VPN app
• Maintenance app

If you do, then that is VERY likely the source of your problem. Not only are these types of apps 100% unnecessary they more often than not create the types of problems you are encountering.

Same questions as malvin1. I have spend hours with both Apple and Comcast. No one seems to know what is going on. The explanation about a separate app password makes sense as this problem started when Comcast required me to change my password. I have added and deleted my Comcast account on Apple Mail at least a dozen times. Every time, with a different result. Sometimes all my emails download in one big file - no folders. Sometimes there are folders. Sometimes only a fraction the emails download. For a while, some of my emails were sending and others were not. Now, nothing sends. Apple tells me to use the Xfinity mobile app for mail but this is very inconvenient. You can't easily move mail to folders or organize it. Also, I don't get a notification when email is received, as I do with Apple mail. It is not a solution. So - how do I set the third party application email for Xfinity? And what password do I use when adding my Comcast email to my Apple mail?

Also, related to no folder structure on my Comcast account in Apple mail - I'm seeing this happens when the incoming port on my Comcast account is 995. It should be 993. Every time I add the Comcast account again, it defaults to port 995. It seems there are multiple problems here.

Same questions as malvin1. I have spend hours with both Apple and Comcast. No one seems to know what is going on. The explanation about a separate app password makes sense as this problem started when Comcast required me to change my password. I have added and deleted my Comcast account on Apple Mail at least a dozen times. Every time, with a different result. Sometimes all my emails download in one big file - no folders. Sometimes there are folders. Sometimes only a fraction the emails download. For a while, some of my emails were sending and others were not. Now, nothing sends. Apple tells me to use the Xfinity mobile app for mail but this is very inconvenient. You can't easily move mail to folders or organize it. Also, I don't get a notification when email is received, as I do with Apple mail. It is not a solution. So - how do I set the third party application email for Xfinity? And what password do I use when adding my Comcast email to my Apple mail?