This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

An error occured with the POP3 mail server

  • 3 replies
  • 1 has this problem
  • 2 views
  • Last reply by Toad-Hall

more options

I have a Comcast email address. I am able to receive emails through Comcast website and through Apple Mail, but not through Thunderbird. This started 5 days ago but it was working before. (6-7 days ago I installed Norton/ Life Lock protection to this MacBook Pro.

Whenever I open Thunderbird or try to get/check new messages I get an error message saying "An error occurred with the POP3 mail server" - how can I fix this?
I have a Comcast email address. I am able to receive emails through Comcast website and through Apple Mail, but not through Thunderbird. This started 5 days ago but it was working before. (6-7 days ago I installed Norton/ Life Lock protection to this MacBook Pro. Whenever I open Thunderbird or try to get/check new messages I get an error message saying "An error occurred with the POP3 mail server" - how can I fix this?

Chosen solution

I also use Norton and had to switch of VPN, but not because of Thunderbird. A load of links either in emails or in websites were being directed to unknown webpages that were irrelevant. Those links were known good solid links eg: to this forum, nothing dodgy. Norton VPN caused too many issues. Thanks for your feedback.

Read this answer in context 👍 0

All Replies (3)

more options

As you installed 'Norton' , is Norton now also controlling the Firewall ?

Exit Thunderbird Access Firewall Make sure Thunderbird is set up as an allowed program, otherwise Norton may be blocking it's access to the internet.

more options

I took my MacBook to my local repair shop. When using Thunderbird email they suggested that I turn off the VPN of Norton. Email is now working. One message I was getting was something like "error because of a 'blacklisted ip address' " My understanding of the VPN process is that it creates a "fictitious" ip address to disguise location and presented a conflict CNC

more options

Chosen Solution

I also use Norton and had to switch of VPN, but not because of Thunderbird. A load of links either in emails or in websites were being directed to unknown webpages that were irrelevant. Those links were known good solid links eg: to this forum, nothing dodgy. Norton VPN caused too many issues. Thanks for your feedback.