Temporarily Blacklisted Account Message — Occurs Daily

Just registering the same issue here.  "Temporarily blacklisted IP Address - try again later"    I can check my comcast.net email on the Xfinity website only.     

GM,

Greeted this morning with both of my Xfinity accounts (biz and personal) getting "disconnected" from phone access. Currently can only access through the web portal @ xfinity.com. Tried resetting passwords, deleting and recreating the accounts, even tried to access through Gmail. Completely random failure after 20 years as a Comcast customer. 

Does it matter if you are an Xfinity business customer?

Here's an update on my end. I arrived on the Cape last night where I have Xfinity as my ISP (as opposed to Verizon Fios in NY). No problems syncing with my iPhone and Macbook's Outlook. (Again, I live in NY where Verizon Fios is my ISP and that's where inexplicably and suddenly Comcast decided to blacklist my IP address out of the blue - and continued to blacklist my house even when I generated a new IP address. Again, is this a Comcast vs Verizon war with the result being long time paying customers are punished? If so, Comcast - [Edited: "Language"]
)

To all;

A quick follow-up to my original post, as it appears this issue is affecting many others—

The problem has been resolved on my end, though I do not know how or why. After speaking with multiple individuals at Comcast/Xfinity over phone, email and this forum, this is the last communication I had, around March 22, 2024. As of this communication, the 'blacklisted' warning has not returned. Again, I do not know how it was resolved. Comcast seems to indicate that one of the devices on my network was causing the problem. I do not recall changing or affecting any other devices (I have only 1 computer and 1 mobile phone). I did somewhat recently switch from AT&T to Verizon on my iPhone, and it sounds like others are experiencing an issue with Verizon. I have no idea how that factors in. Either way, this is the last communication with Xfinity that I had, when the problem resolved. Hopefully it offers some more clues:

I'm having the same issue and need some help. It seems like I can send email mail (even ran a test) but I'm having incoming email issues. Thanks.

This just happened to me this morning (June 10 '24). I can see email on the Comcast website, but cannot access it from the Mac Mail tool. I get a "temporarily blacklisted IP address" message. I've tried resetting the password. Even deleted my Comcast account and reinstalled it (which was a BIG mistake since I've now lost all email history and cannot search for it in my Mail app.)

Apple told me to call 888-565-4329, and I was told that there was an email upgrade and that it would be fixed in a few days. Based on what I'm seeing in this thread, this has been an ongoing issue for a long time, and I am skeptical that it is going to be fixed soon. 

Does anyone understand exactly what's going on?

Edited to add: Fios ISP

This same situation has happened to me today-June 10,2024. Random emails come through then nothing. I can view on website but this issue is ridiculous. I have been using the laptop since 2020 and no problems. I hope it gets resolved ASAP. BTW- I have had a Comcast email for over 20 years. 

So, just had this same thing happen to me for the first time...have had a Comcast/Xfinity email address forever, but am NOT presently a Comcast/Xfinity customer, we use VZ Fios.  Also, have had my email run through to Outlook forever, so this was very weird.  On Outlook 2019 desktop version.

That said, I unplugged my router, waited 30 seconds or so, restarted my computer and then plugged router back in...and bingo, emails all came through and is working again now...fingers crossed.

I dont think its a verizon thing, i think its a client thing, "new" outlook allows access while classic does not, I havent found any mobile clients that appear to be compatible, my guess is that they changed something with authentication that most clients do not support.

Longtime Comcast email user and today I get the "blacklisted" message while using Outlook. "Your IMAP server wants to alert you to the following: Temporarily blacklisted IP Address -- try again later." Ugh... now what?

The web version of email continues to work but Outlook is by far my go-to platform for email, calendar, contacts, etc.

If you look up your IP address here: https://whatismyipaddress.com/

And then paste it in here: https://hetrixtools.com/blacklist-check/

You can see if your IP address is on a blacklist or not.  

I got the instructions here: https://docs.hetrixtools.com/how-to-remove-your-ip-from-the-comcast-blacklist/ 

Also, just noticed, that after all this chatter here, I do not see the message -- at least for now.  

After the "blacklisted" message appeared yesterday for the first time, I shut down the router... problem solved temporarily at least. Now this morning I find that I am "blacklisted" once again! Web version continues to work. I am accessing via Spectrum as the ISP. 

I saw that our Comcast email addresses were part of a data breach, so today I reset the passwords through Edge browser on Windows for all of my family's Xfinity email accounts.  We have mail viewing set up on our iPhones through the Outlook mail client.  Obviously, it took a while to get the new passwords entered on our phones, and in the meantime, our Outlook clients prompted for credentials, so they had been trying the old cached passwords and were understandably generating bad login attempts.  Now we've updated all of the clients with the new passwords, but we can't retrieve email on our home WiFi - it says our IP address has been blacklisted.  I'm sure there's automated protection on the backend detecting the failed login attempts as an attack of some sort, but now we can only use email on our phones if we disconnect from WiFi.  Once we reconnect to home WiFi, we get blocking messages in the email client.  We're probably triggering the blacklisting over and over simply by trying to log in now with the correct credentials.  I called the Customer Account & Security Department at 1-877-842-2112 and she had me reset all of the account passwords again!  I've spent four hours today trying to get things resolved, with no help from Xfinity.  This is so frustrating.

Been "blacklisted" for  two days.   I called the 888 number.  Spent over one and a half hours on the phone with xfinity "experts."   Got transferred three times.   NO ONE really understood the issue.  Most of the time all they did was read from a script telling me how much they wanted to help.  Was a complete waste of time.  The third person ended by establishing a "ticket" and said someone would get back to me within 72 hours.  Only time will tell but I am not holding my breath.