topic Re: Problem with new install on Windows 11, using Thunderbird in Email

Problem with new install on Windows 11, using Thunderbird

melmerby — Wed, 02 Sep 2026 17:11:02 GMT

Hi all

Following a problem with my previous PC (Win 10), I have moved to a Win 11 PC that did not have have a mail program. However using a new install of Thunderbird (154.0) and despite using the same settings as on the Win 10 PC I cannot send mail, I can still receive mail

I have done a setup from new several times before using Thunderbird and this is the first time I have had a problem.

Any suggestions?

Thank you.

Edit I'm on Plusnet

Re: Problem with new install on Windows 11, using Thunderbird

PhilipHeyes — Wed, 02 Sep 2026 18:23:29 GMT

Can you provide a screen shot of the error message or an exact copy of it ?

Re: Problem with new install on Windows 11, using Thunderbird

Ali_A — Thu, 03 Sep 2026 07:45:43 GMT

Hi @melmerby

Please re-check the settings you're using on our How to set up Plusnet email - what settings to use page, where you can also view the guide on how to setup using Thunderbird.

We also have information about our services moving to a new supplier called Greenby and what this means for you.

Ali

Re: Problem with new install on Windows 11, using Thunderbird

melmerby — Thu, 03 Sep 2026 08:05:18 GMT

Thanks for the reply, attached is a screenshot of the error.

(Entering a password brings up another error)

Keith

Re: Problem with new install on Windows 11, using Thunderbird

PhilipHeyes — Thu, 03 Sep 2026 08:36:30 GMT

For all email servers we only use the mailbox email address as the Username.

We avoid use of the old style of : <account> or <account>+<name> or an Alias

Links to reset passwords are :

https://www.plus.net/manage_my_mail/

https://greenby.com/

Re: Problem with new install on Windows 11, using Thunderbird

melmerby — Thu, 03 Sep 2026 17:01:28 GMT

Hi Philip

I'm a bit confused here (email settings are not my forté)

My settings are

Incoming mail: POP3 server: mail.plus.net port:995 security: SSL/TLS, username is my username (not my email address)

Security is normal password

It works

Outgoing mail: STMP, server: relay.plus.net port is 465 or 587 (tried both) security SSL/TLS, again username is my username (not email address) Security is normal password

It does not work

What do I need to change?

Thanks Keith

BTW with port 465 (not 587) Thunderbird will make a secure connection to the outgoing mail server (see screenshot)

Re: Problem with new install on Windows 11, using Thunderbird

PhilipHeyes — Thu, 03 Sep 2026 18:01:15 GMT

Has your email account migrated to Greenby ?

Re: Problem with new install on Windows 11, using Thunderbird

melmerby — Thu, 03 Sep 2026 21:53:25 GMT

How would i Know that?

Re: Problem with new install on Windows 11, using Thunderbird

pvmb — Thu, 03 Sep 2026 22:11:40 GMT

@melmerby

"How would i Know that?"

1. By having received an email telling you so.

2. By being able to log in to your account via the Greenby portal (using your Plusnet account name and password).

Re: Problem with new install on Windows 11, using Thunderbird

melmerby — Fri, 04 Sep 2026 08:19:02 GMT

Hi pvmb

It appears that I have.

it happened on 17 Dec 2025.

I can't remember having such an email☹️

Does that mean I can/or have to use different settings?

Cheers Keith

Re: Problem with new install on Windows 11, using Thunderbird

pvmb — Fri, 04 Sep 2026 08:34:46 GMT

@melmerby

"It appears that I have.

it happened on 17 Dec 2025.

I can't remember having such an email"

It happens (or not)! I received the transition email but not the 30 days forewarning email.

I take it you have confirmed this now by logging in to Greeny portal. At lest you will be in a position to use Greenby webmail, even if only for now.

"Does that mean I can/or have to use different settings?"

I assume you mean with client email software on your device? Ideally you shouldn't need to change (according to Plusnet), but in practice you may have to. Without posting your email address on here, can you say what 'type' of email address you have: Plusnet, Force9, Madasafish etc.

Re: Problem with new install on Windows 11, using Thunderbird

melmerby — Fri, 04 Sep 2026 12:50:23 GMT

I'm on Plusnet and have been for a very long time.

Just standard set up using Thunderbird

This is the first problem I have ever had with the mail service through several different installs

Re: Problem with new install on Windows 11, using Thunderbird

Ali_A — Sat, 05 Sep 2026 14:57:10 GMT

Hi @melmerby

I'd recommend having a read through our Changes to Plusnet email and domain services FAQs page, which has information about the settings to use in your email client.

- Ali

Re: Problem with new install on Windows 11, using Thunderbird

melmerby — Sat, 05 Sep 2026 13:33:46 GMT

Hi Ali

Are you saying that after migration of my account to Greenby, which has happened, configuring a new email program install means I need a Greenby account to change any settings?

Cheers Keith

Re: Problem with new install on Windows 11, using Thunderbird

Ali_A — Sat, 05 Sep 2026 14:59:28 GMT

@melmerby

Your email and domain services will be provided by Greenby moving forward. As a Greenby customer you’ll need an account with them so you can make changes to your email settings.

We’ll also continue to send service messages and essential information to the email address linked to your broadband account, so it’s important you create an account with Greenby.

They’ll send you a welcome email and explain how to set up your account. It’s really straightforward and should only take about five minutes.

Ali

Re: Problem with new install on Windows 11, using Thunderbird

melmerby — Mon, 07 Sep 2026 08:31:40 GMT

I have gone back to re-entering all my settings in Firefox, making sure that something wasn't accidentality incorrectly entered due to "finger" problems.

I still got the pop-up asking for password when I sent a mail but this time it worked after entering the rather long password I have.

I can only assume that fingers were the problem, strange that incoming mail still worked.

Cheers

Keith

Re: Problem with new install on Windows 11, using Thunderbird

melmerby — Tue, 08 Sep 2026 17:05:04 GMT

Strange. Yesterday It went off again so had to re-enter the settings and password, it rook several goes before it worked

Today I had to enter the password for it to work, otherwise OK

Shouldn't Thunderbird save the log in details?

Keith

Re: Problem with new install on Windows 11, using Thunderbird

RealAleMadrid — Tue, 08 Sep 2026 18:36:35 GMT

@melmerby Could your problem be similar to this .....

It may be related to a new tranche of Plusnet email migrations which started recently.

Re: Problem with new install on Windows 11, using Thunderbird

melmerby — Wed, 09 Sep 2026 13:30:39 GMT

Don't know.☹️

From info, I was migrated last year to Greenby and I don't have webspace

This has only happened since I changed PCs last week. I loaded a new copy of Thunderbitd and used the same log in details that were on the old PC.

Receiving mail isn't a problem but sending/replying is very hit and miss and has been from day 1 on this PC.

If this is a Greenby problem I shall be looking elsewhere for mail service. I'm going to have to leave Plusnet soon anyway as I need a home phone and Plusnet aren't offering VOIP. The pain will be changing all the email addresses at my various contacts.

Shame, I've been with Plusnet a long time and rarely had a problem, which was quickly sorted.

Cheers

Keith

Re: Problem with new install on Windows 11, using Thunderbird

bmc — Wed, 09 Sep 2026 13:41:35 GMT

@melmerby

If your'e email has been migrated to Greenby then it doesn't matter if you change ISP.

While PN don't offer VOIP there's nothing to stop you using a VOIP provider for phone services while staying with PN for internet.

Brian