Visitor
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3 Messages
IMAP email issues
I have been using Comcast mail on my iPhone for 15 years I now have a 16 pro max. I keep getting a pop up say my IP address is blacklisted and be sure I’ve entered in my correct password so my email will not come in although I can delete email and search..
i can get into mail online directly so I have verified my password works. Occasionally email comes in then stops again overnight. I went to Verizon that told me this was a common problem but had no support to offer me.
Many years of information are in this account I need access to. Please explain what I can do. Using ports 993 and 587 that I have verified are correct online. Thank you so much!
XfinityGabriel
Official Employee
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3.2K Messages
2 months ago
Hi there! Thank you for reaching out. I can understand the frustration this email issue has caused and know how important long‑term access is. Especially after 15 years of using Comcast email on your iPhone. You’ve reached the right support channel. Over social media, we are a team of experts who specialize in resolving email concerns. We can help.
The “IP address is blacklisted” message you’re seeing typically points to a temporary connection or authentication block between the device and the Comcast mail servers. Since you’re able to log in online and your password is confirmed to be correct, the issue is most likely related to the email app settings, network connection, or a security filter rather than your account itself.
Here are the steps I recommend:
This refreshes your connection to the Comcast servers.
Go to Settings > Mail > Accounts
Select your Comcast account → Delete Account
Re‑add it under Add Account > Other > Add Mail Account
(Your emails should re-sync from the server.)
Use the official settings:
Incoming (IMAP)
Outgoing (SMTP)
Even if these match, re‑entering them can clear caching issues.
Sometimes your mobile IP can trigger automated filters.
Go to Settings > General > Transfer or Reset > Reset > Reset Network Settings
(This will remove saved Wi‑Fi networks but won’t delete data.)
Or you can switch Wi‑Fi off and on or try a different Wi‑Fi connection to see if mail starts flowing again.
Since you have a new iPhone 16 Pro Max:
Make sure iOS is up to date
Go to Settings > Mail > Accounts > Fetch New Data and set Comcast to Fetch or Push (if available)
Toggle Mail off and on for the Comcast account
If the system temporarily blocked your IP for unusual login attempts, it may clear on its own, but you can also:
Visit this link xfinity.com/password
Sign in → choose "Reset email settings / unblock" if prompted.
If the block persists, contact Comcast Security Assurance directly: 1‑888‑565‑4329.
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user_271dd3
Visitor
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9 Messages
7 days ago
@XfinityGabriel @Xfinity Support I'd be interested to know if this is resolved, since I have a similar issue. On my iPhone 13, my Xfinity email stopped loading 4/13 and I got the Account Error message, most recently today 4/14, "Cannot get mail; the mail server "imap.comcast.net" is not responding. Verify that you have entered the correct account info in the Mail settings. Server code "SERVERBUG" server message "Internal error occurred. Refer to server log for more information. [2026-04-14 00:50:57] (0.172 + 0.000 + 0.002 secs).".
I've tried deleting the account and found that the IMAP option is not available, it automatically defaults to POP so I used the common workaround to use a fake domain, selecting IMAP and then entering all the data correctly, to no avail. If I use POP, I only receive the 2 most recent email, and no subfolders under the Inbox. This issue began on Monday 4/13. Any help is greatly appreciated!!
Keith
(edited)
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thednbselecta
Contributor
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11 Messages
3 days ago
I’m having this same issue for both me and my wife. Passwords correct, I can access the email from my browser, all other email works, and we only have this issue when on WiFi. This is clearly a Xfinity issue, not an apple of personal user issue.
xfinity, you need to open a trouble ticket on this issue to find out why so many unconnected users experience the same issue and have your technicians deploy a fix to correct it. Changing passwords or deleting and re-adding accounts doesnt work and doesn’t address the root of the issue. You guys need to address the root on your own end.
So instead of regurgitating the same old generic troubleshooting steps that dont work, open a ticket and let’s solve this for good.
The actual error is that it asks for your password, but when you enter the correct password it still gives the error and then says the IP address is “blacklisted”. Why are you guys blacklisting valid IP addresses that have been used for years?
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