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bitsmithsys
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Thursday, December 4th, 2025 3:56 PM

Cannot access IMAP server, get "Temporarily blacklisted IP Address" on phone and outlook.

Yesterday, my wife and I both started getting prompted for our passwords on our comcast.net email accounts on both outlook and our iPhones.  On the iPhone, I the error "Server code "ALERT:, server message "Temporarily blacklisted IP Address". 

Note xfinity isn't in our new location, but we've been accessing our legacy email for over 8 years here.  If I connect with VPN enabled, it works on the PC so it's something with our MidCo IP address which has been working for several months since we switched in the summer. 

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XfinityJeff

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445 Messages

5 days ago

Good morning @bitsmithsys, and thanks for posting to the Xfinity forums with your issue, I hope this message finds you well. As someone that uses email for both work and personal, I can understand how frustrating it can be if you cannot access your email. When you are getting this error, are you checking the email using the Xfinity website, or a third party app such as Outlook?

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user_ode9g8

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I have this same issue as of Dec 8 morning. Former Xfinity customer with legacy email. Rebooted my server to grab another IP address to no avail. I am able to send web based email to my Comcast.net email and other email addresses. Emails do not show up in my app mail accounts. Running Mac OSX 17. 

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3 days ago

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bitsmithsys

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@XfinityJeff​ It looks like my earlier reply was lost.  As mentioned, I’m having this issue with outlook and iPhone mail app.  But only from home.    The phone works fine on carrier’s network and outlook is fine if connected to VPN.  Other messages below confirms my IP is likely blocked, which is odd in that it hasn’t recently changed. How best to get this unblocked?

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2 hours ago

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user_w8rsh7

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1 Message

5 days ago

I am having the same problem on all my devices.  please help!

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XfinityJustinC

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1.9K Messages

Hello, @user_w8rsh7 thank you for reaching out over Xfinity Forums and wanted to see if you're still experiencing issues with your email access. It sounds like you access your email via 3rd party client. 

If so I'd recommend ensuring that there were no changes to the 3rd client settings: https://www.xfinity.com/support/articles/email-client-programs-with-xfinity-email

 

or the 3rd party access: https://www.xfinity.com/support/articles/third-party-email-access

You can also check your firewall settings to ensure that nothing changed to access or any of your ports. 

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3 days ago

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user_gbgmuo

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5 days ago

I too am  having the same issue. PLEASE ADVISE COMCAST or XFinity or whatever else you want to be called. Another 24-hoours of this [Edited: "Language"] & I'm closing my account!!!!!

(edited)

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XfinityMarshante

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729 Messages

Hello @user_gbgmuo, thanks for the comment. Is the Third-party email client access enabled in your Xfinity settings? 

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3 days ago

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resmopar

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9 Messages

4 days ago

I am experiencing the same problem here as well. Former Comcast customer here since October 2017 when I moved out of their territory. I use Thunderbird here to handle my two Comcast email addresses. Working without a hiccup for past 8 years. Suddenly, on Saturday December 6th, Thunderbird threw an error saying IP address temporarily blacklisted. Then Thunderbird prompted and said login failed and gave me choice to  either enter new password or cancel. I hit cancel and waited an hour. Tried again and Thunderbird did connect and seemed fine. Then, within 20 minutes, got the blacklisted IP error again followed by prompt saying login failed and to enter new password or cancel. As the OP mentioned, if I connect using a vpn, I can connect like normal and all is good. I also have one of my Comcast email accounts on my Android phone being handled via Gmail. It works fine on my phone. In searching for this error, I did come across several sites, including Xfinity, stating they are migrating all comcast.net email addresses to Yahoo Mail. It states we will be notified when it's time to migrate over. I have yet to receive notification. One last note: I can access both of my email accounts thru the Xfinity website without any problems. I'll monitor this thread for further updates.

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XfinityBrianH

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1.8K Messages

 

resmopar Can you please send us a DM. You can start by clicking the chat icon located in the top right corner of your forums' page when signed in. Once there, you can direct your messages to "Xfinity Support." Please add your full name and service address to help us locate your account. Let me know if you have any questions. 

 

 

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2 days ago

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resmopar

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@XfinityBrianH​ Thank you for your reply. I hit the chat icon above and it switches to the page and then all I get is a spinning circle. As of 12PM EST, I tried Thunderbird again and I was able to log in and retrieve emails with no errors. Seems I'm not blacklisted at the moment.  As was the case several days ago, I'm still able to access email from my Android phone thru Google. And I can still access both accounts via the Xfinity website. If I encounter further problems, I'll try the chat again. If that still does not work, I'll reply to this thread to give an update.

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1 day ago

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XfinityBrianH

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1.8K Messages

 

resmopar Ok great, we are here if you have any issues!

 

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1 day ago

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user_gyyxyz

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2 days ago

Same here!  Please advise. 

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user_ode9g8

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4 Messages

It took a call to Level 2 support, not a chat. An actual call. Xfinity had to do the work on their end to unblock the IP address and then I had to relog in with email. I also rebooted my modem for a new IP and rebooted my email app. This did not affect web based Xfinity email. Email passwords were good, the request from your application is because of the IP blocking, your log in credentials are probably just fine. 

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2 days ago

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bitsmithsys

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3 Messages

2 hours ago

Why are my replies getting lost?

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