We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

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

Thunderbird: Keeps asking me to add security exception

  • 1 tontu
  • 1 am na jafe-jafe bii
  • 3 views
  • i mujjee tontu mooy christ1

more options

I've been using Thunderbird for ages without any (real) problems. My security certificate expired a few weeks ago, but now every time I try to retrieve my mail (by clicking "Get Messages") a pop-up appears (see image)

The location (pop3.upcmail.nl:995) isn't the address of my mail server. If I look under Thunderbird's "Server Settings", I see the correct address. Even if I change the server address to something else, the pop-up 'add security exception' still displays pop3.upcmail.nl as location. I'm not worried this is some kind of hack or virus or malware since I recognize the address - it's the mail server I used well over ten years ago (in Thunderbird).

I have checked so far:

- cert_override.txt , but the wrong address is not in there. - Also disabled Eset, but did not solve. - the folder of my mailbox in profiles is called pop3.upcmail-1.nl (since i am using this map for over 10 years and changed providers a few times)

Thunderbird keeps wanting to download a certificate from an over 10 year old and not in use mail server instead of my current one. Thus no e-mails are retrieved. So what is actually going on here? And more important, how can I solve this so I can get to my email again?

I've been using Thunderbird for ages without any (real) problems. My security certificate expired a few weeks ago, but now every time I try to retrieve my mail (by clicking "Get Messages") a pop-up appears (see image) The location (pop3.upcmail.nl:995) isn't the address of my mail server. If I look under Thunderbird's "Server Settings", I see the correct address. Even if I change the server address to something else, the pop-up 'add security exception' still displays pop3.upcmail.nl as location. I'm not worried this is some kind of hack or virus or malware since I recognize the address - it's the mail server I used well over ten years ago (in Thunderbird). I have checked so far: - cert_override.txt , but the wrong address is not in there. - Also disabled Eset, but did not solve. - the folder of my mailbox in profiles is called pop3.upcmail-1.nl (since i am using this map for over 10 years and changed providers a few times) Thunderbird keeps wanting to download a certificate from an over 10 year old and not in use mail server instead of my current one. Thus no e-mails are retrieved. So what is actually going on here? And more important, how can I solve this so I can get to my email again?
Nataali seetu yiñ ci takkaale

All Replies (1)

more options
My security certificate expired a few weeks ago,

Are you talking about the server certificate?

but now every time I try to retrieve my mail (by clicking "Get Messages") a pop-up appears (see image)

I suppose this means the cert has been renewed, and you're having the problem since?

Click 'Get Certificate' and then 'View' to inspect the certificate. Post a screenshot of the Certificate Viewer window with the following information visible:

  • Issuer
  • Valid from date
  • Subject

The error message indicates the cert subject doesn't match the server you're trying to connect to. Most likely whoever issued the new cert made a mistake.

Thunderbird keeps wanting to download a certificate from an over 10 year old and not in use mail server instead of my current one.

I don't understand what that means. Please explain.