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.