I know how to log into my Comcast account to read email and sometimes do.  But much prefer to use gmail as my mail client.

same issue here. login to xfinity works. gmail server seems to be blacklisted by comcast

Hello user_wcbl78  Is the error you're showing that the Comcast SMTP is being blocked, or vice versa? This would dictate how we address this. 

The error message is precisely this:  "[AUTH] Temporarily blacklisted IP Address - try again later" Other than authorization it happens when doing pop from Gmail for everyone that is complaining. It errors about every four times to one success. So, good luck with an intermittent problem. It may just be doing a pop protocol update on your email servers.  

Same here. Has nothing to do with SMTP—this is receiving mail. The POP fetch throws this error on my home computer/network, my work computer/network, doesn't matter how I connect or what my IP is... which seems to indicate Xfinity is seeing Google/Gmail IPs as blacklisted. I have been running this same setup for over 10 years with no issues until the past few months. 90% of the time gmail fetch returns this error. Am about to drop my xfinity email address if this continues.

I went through a similar situation with my Gmail earlier this year, @user_my1x6e. It was really frustrating because I didn't even realize I was missing emails the first few days. I learned that Google will flag other domains from time to time based on user reports, similar to how legitimate email is sometimes incorrectly identified as spam, and they will temporarily blacklist the IP address as a safety precaution. It usually only lasts 2-4 weeks. If you can still access your email through https://xfinityconnect.email.comcast.net and none of your POP3 settings were changed, you may just need to wait it out until Gmail removes the flag, or it times out on its own.

The error message is coming from the Comcast email server indicating that the Gmail IP address is blacklisted and so Comcast will not allow Gmail to fetch my emails.  There is a workaround for the problem.  In Gmail, go to Settings -> See All Settings -> Accounts and Import -> Check mail from other accounts.  Select Check mail now and keep selecting Check mail now until the error goes away and your emails are fetched.  This usually results in emails being fetched after one or two tries.  To me this indicates either that the IP address is being removed from whatever blacklist Comcast is using or that Gmail assigns a different IP address on each fetch attempt and eventually uses one that is not on the Comcast blacklist.

This is a Comcast problem.  Comcast should not be blacklisting Gmal IP addresses.

@ user_wcbl78

Thanks this did work, still its not something I should have to do. The extra time it takes to do these steps, not to mention this doesn't work on my phone, so I have to keep logging into Gmail on a computer to work. We spend so much money on this stuff and always have problems. I have had this issue happen at least once a year. Usually deleting and re adding the account fixes it, but this time its still an issue. 

Thank you - this worked for me too.  Fetched 170 emails I didn't realize I was missing.  I agree, this is not something we should have to do.  It worked well for a long time, then stopped.  This is an xfinity issue to solve.  They should be allow-listing the gmail IP addresses. 

@user_my1x6e​ Hi, I have had the same issue as everybody else on this forum. Blacklisted ip address. I fixed it by logging into my router, going to security and then firewall. There were some blocked ports in the firewall settings, namely, Gmail ports 995, and 465, Imap port 993, Pop3 port 110, Pop3s port 995 and SMTP port 25. Once I unchecked these blocked ports, everything works fine now. I am able to download all of my email and I no longer receive the temporary blocked ip address error. Hope this helps

@ben2025​ Hi, I have had the same issue as everybody else on this forum. Blacklisted ip address. I fixed it by logging into my router, going to security and then firewall. There were some blocked ports in the firewall settings, namely, Gmail ports 995, and 465, Imap port 993, Pop3 port 110, Pop3s port 995 and SMTP port 25. Once I unchecked these blocked ports, everything works fine now. I am able to download all of my email and I no longer receive the temporary blocked ip address error. Hope this helps

I am having this same message from my iPhone MAIL app. I’ve used it for years and years, and never had this problem. I changed my password twice, and it didn’t help. I can log into the comcast/xfintiy portal and get my mail, but that is inconvenient. The same thing is happening to my sister (while we’re connected to WiFi). If I turn off WiFi, it works most of the time. This has got to be an error on the comcast side? So many people are having the same issue. Help??!!

@JG987​ were you able to fix the issue on your iPhone? The same thing is happening to us. 

Hello JSBlakey1975, my email is super important to me as well, so I get wanting a resolution on this. Are you able to confirm your email settings are still intact for your iPhone email? This 'walkthrough' can help. 

@JSBlakey1975​ Hi, I have had the same issue as everybody else on this forum. Blacklisted ip address. I fixed it by logging into my router, going to security and then firewall. There were some blocked ports in the firewall settings, namely, Gmail ports 995, and 465, Imap port 993, Pop3 port 110, Pop3s port 995 and SMTP port 25. Once I unchecked these blocked ports, everything works fine now. I am able to download all of my email and I no longer receive the temporary blocked ip address error. Hope this helps

FYI, this conversation was specific to GMail, but I suspect the underlying issue is the same. Comcast/Xfinity is (temporarily?) blocking the connection request, so mail cannot be retrieved.

On iOS, I believe the XFinity app is no longer in use for email.  Just use the browser.

@ShellShocked​ Hi, I have had the same issue as everybody else on this forum. Blacklisted ip address. I fixed it by logging into my router, going to security and then firewall. There were some blocked ports in the firewall settings, namely, Gmail ports 995, and 465, Imap port 993, Pop3 port 110, Pop3s port 995 and SMTP port 25. Once I unchecked these blocked ports, everything works fine now. I am able to download all of my email and I no longer receive the temporary blocked ip address error. Hope this helps

Have you had any success fixing this? I’ve had my comcast email for 25+ years! Everything is connected to it, and I really don’t want to use another email. Ugh. 

@user_r6ve6x​ Hi, I have had the same issue as everybody else on this forum. Blacklisted ip address. I fixed it by logging into my router, going to security and then firewall. There were some blocked ports in the firewall settings, namely, Gmail ports 995, and 465, Imap port 993, Pop3 port 110, Pop3s port 995 and SMTP port 25. Once I unchecked these blocked ports, everything works fine now. I am able to download all of my email and I no longer receive the temporary blocked ip address error. Hope this helps

Hello user_r3e65s, thank you for reaching out via our Xfinity Community Forums. I understand how frustrating it is to have trouble accessing your Comcast email through Gmail. I've reviewed the details you provided and understand that you're encountering an intermittent "Authentication error" and the message "Temporarily blacklisted IP Address."

This can be quite disruptive, and I apologize for the inconvenience it's causing. The error message, "Temporarily blacklisted IP Address" Error typically indicates that our security systems have detected unusual activity from your IP address. This could be due to multiple failed login attempts, suspicious activity, or even issues with your internet connection.

Here's a breakdown of possible fixes and troubleshooting steps when it comes to accessing your email through Gmail, please let us know if you continue to have issues. 

1. Check Comcast Email Settings:

• Third-Party App Access:

  • Enable: In your Comcast email settings, ensure "Third-Party App Access" is enabled. This allows applications like Gmail to connect and retrieve your emails.
  • Note: If recently disabled, you might need to re-add your Comcast email account to Gmail.

• Two-Factor Authentication (2FA):

  • Review: If you have 2FA enabled, you might need to generate an app password specifically for Gmail. This app password will be used instead of your regular Comcast password when setting up email retrieval in Gmail.

2. Troubleshoot Network Connectivity:

• Check Internet Connection: Ensure your internet connection is stable and functioning correctly.
• Wi-Fi Issues: If using Wi-Fi, try connecting to a different network or using a wired connection to rule out Wi-Fi interference.
• VPN Usage: If using a VPN, temporarily disable it to see if it interferes with Comcast email access.

3. Update Software and Apps:

• Gmail App: Update the Gmail app on your phone and tablet to the latest version.
• Operating System: Ensure your phone and tablet are running the latest version of their respective operating systems (iOS, Android).

4. Consider Alternative Solutions:

• IMAP vs. POP3: Experiment with using IMAP instead of POP3 to retrieve your emails in Gmail. IMAP allows you to access emails from multiple devices without deleting them from the server.
• Comcast Email App: If you're primarily experiencing issues with the Gmail app, consider using the official website to log in and check your email for a more reliable experience.

Going on 15 hours without gmail being able to get my comcast email. I don't have access to gmail desktop to do a manual pull. Absolutely ridiculous! Fix this, Comcast! See comments below. 

1. Check Comcast Email Settings:

• Third-Party App Access:

  • Enable: In your Comcast email settings, ensure "Third-Party App Access" is enabled. This allows applications like Gmail to connect and retrieve your emails.
  • Note: If recently disabled, you might need to re-add your Comcast email account to Gmail.  ENABLED
  • Review: If you have 2FA enabled, you might need to generate an app password specifically for Gmail. This app password will be used instead of your regular Comcast password when setting up email retrieval in Gmail.  shouldn't matter - xfinity is blocking gmail IP address - that is the issue

2. Troubleshoot Network Connectivity:

• Check Internet Connection: Ensure your internet connection is stable and functioning correctly. CONNECTION IS GOOD
• Wi-Fi Issues: If using Wi-Fi, try connecting to a different network or using a wired connection to rule out Wi-Fi interference. no issues with wifi
• VPN Usage: If using a VPN, temporarily disable it to see if it interferes with Comcast email access. tested with and without vpn - NO DIFFERENCE

3. Update Software and Apps:

• Gmail App: Update the Gmail app on your phone and tablet to the latest version. LATEST VERSION OF APP
• Operating System: Ensure your phone and tablet are running the latest version of their respective operating systems (iOS, Android).LATEST VERSION OF IOS (18.2)

4. Consider Alternative Solutions:

• IMAP vs. POP3: Experiment with using IMAP instead of POP3 to retrieve your emails in Gmail. IMAP allows you to access emails from multiple devices without deleting them from the server. USING POP3 
• Comcast Email App: If you're primarily experiencing issues with the Gmail app, consider using the official website to log in and check your email for a more reliable experience. N/A - I DON'T WANT TO USE COMCAST EMAIL APP OR INTERFACE

Any luck fixing the problem? My sister and I are experiencing the same thing. 

@JSBlakey1975​ Hi, I have had the same issue as everybody else on this forum. Blacklisted ip address. I fixed it by logging into my router, going to security and then firewall. There were some blocked ports in the firewall settings, namely, Gmail ports 995, and 465, Imap port 993, Pop3 port 110, Pop3s port 995 and SMTP port 25. Once I unchecked these blocked ports, everything works fine now. I am able to download all of my email and I no longer receive the temporary blocked ip address error. Hope this helps

please comcast, this is not a user issue. this is a comcast internal security settings issue. You are blocking Gmail from picking up messages. Get the security team in here and have them resolve it. Please stop gaslighting your customers. 

@user_k44ef4​ Hi, I have had the same issue as everybody else on this forum. Blacklisted ip address. I fixed it by logging into my router, going to security and then firewall. There were some blocked ports in the firewall settings, namely, Gmail ports 995, and 465, Imap port 993, Pop3 port 110, Pop3s port 995 and SMTP port 25. Once I unchecked these blocked ports, everything works fine now. I am able to download all of my email and I no longer receive the temporary blocked ip address error. Hope this helps

@XfinityPeterH​  Is this a bot account from Xfinity?  It is very clear that this is NOT individual devices connecting.  Xfinity is blocking GMAIL SERVERS from pulling our emails.

The xfinity web site is a terrible user experience and doesn't allow users to get emails pushed to them in a timely manner in order to read and reply to them.

Please just escalate this issue to the group that can whitelist the gmail IP addresses.  This should be a simple fix.

gopheritall the contact information for our CSA team was provided. They are equipped to take a closer look at an issue like this, and they can take the right actions to determine what's causing the issue. 

@gopheritall​ same, but it’s not just Gmail. My iPhone mail app is getting the same error. Any luck fixing it?

@XfinityJosephA​ 

Does anyone remember the Godzilla movies?  Recall how two giants were fighting in the city.  Godzilla (Comcast) would toss Mothra (gmail) into buildings and crush the building (customer) and vice versa.  At the end of the fight, one would fly off and the other retreats to the sea.  The only thing destroyed was the city (Comcast and GMail customers).  

Good evening JSBlakey1975 is this issue only occurring when using the 3rd party email client? Are you able to login to your Xfinity email using xfinity.com? 

@thekman777​ 

When I had the problem, it was the IP address my provider assigned me that was blacklisted at SPAMHAUS and Comcast used that to flag it for spam. To correct the problem, I had to turn my modem (it is mine not the ISP so they couldnt do it from their end) off for several hours.  I did it when I went to bed and turned it back up several hours later.  The new IP immediately allowed all messages through.  Even if your ISP give you a dynamic address, sometimes that IP does not change as frequently as they say.  So far I have not had the issue return.

@thekman777​ The "Solution" is to stop using xfinity email completely. 

@NONAMER123 @For some of us, that really isn’t a feasible option. I’ve had my comcast email address for probably 25 years? It would be disastrous to lose it. So many accounts and recovery accounts… etc, etc…

@thekman777 My sister and I both had this issue. We would just turn off WiFi on our phones to get the email messages to come through. It wasn’t too bad for her, as she gets pretty good signal at home. I have crappy signal at her house. LOL 

it worked, though. Until about four days ago. The email has magically started working again (I’m going to regret typing that)… so, for a solid four days, everything is working as it should. 

side quest: now I need to figure out why all of a sudden my phone won’t connect to my rollerskate! (Fiat 500) LOL 

Hi there, @thekman777! I can certainly understand your concerns! Email is of course very important. Have you attempted any of the steps outlined in the other responses? 

Hey @lana12345, Thank you for visiting our official Xfinity Forums Community support page. We greatly appreciate you taking the time to share your experience regarding the Xfinity Email service through the third-party platform. Do you have any issues accessing your Xfinity Email through our native Xfinity Email web portal? You can quickly and easily access by Clicking Here.

@jack_v​ Nevermind.  I checked today and am still getting the blacklist notification and mail not retrieved.  Retry usually gets it again, but I'd like it to simply work.

@jack_v - Thank you for leaving comments with your similar concerns. I'm sorry to hear about the trouble you've had, and I'd love to see what our team can do to help! We're typically great to work with because we'll always help however we can, providing all the information you need! Have you reported these concerns, either to our Customer Security Assurance (CSA) team, or by filling out this Service Policy Assurance (SPA) form?

Server returned error: "[AUTH] Temporarily blacklisted IP Address - try again later. I have same problem

Hello WizA, I use my email daily, so I can only imagine the impact on you. I'd love to work more with you on this and help find a resolution. To start, I'd like to make sure we're on the same page. Are you able to log in to your Xfinity account and access your emails?

Hello, @user_ftvmrr. Have you reported these concerns, either to our Customer Security Assurance (CSA) team, or by filling out this Service Policy Assurance (SPA) form?