Temporarily blacklisted IP Address

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. 

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

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.