Has anyone discovered how to modify Thunderbird to access Greenby???

[#1]

Listen Mr/Ms Superuser:

I may be a senile old buffer, but in my youth I worked for 13 years as an engineer for various ANALOGUE companies - Decca, Grundig, Dolby Laboratories, RS Components, Soundcraft, Soundtracs (now Digico)
So an electronic engineering approach is not alien to me.

We had a catch-phrase in electronic test engineering - "Suck it and see"

In the case of the settings I posted above,  I am currently using them and THEY WORK

As regards whether my house and my PlusNet account is a "Public Network" - they are not.

My operating system is up-to-date Windows 11 Home - version 25H2

The Thunderbird software is also up to date: 

Thunderbird Desktop

Version 140.6.0esr | Released December 9, 2025

You seem to be insisting that I have to revert to your suggested settings which DIDN'T WORK

Your further comments about obsolete software in public environments are apparently saying that my settings could cause other users to be hacked in Wetherspoons.

Be that as it may I need my Thunderbird email reader to work at home.

[#2]

Which is fine for you in your environment to your level of acceptable risk.  It working for you is probably connected to some other coincidental factor, such as Thunderbird fixing its knicker elastic.

That does not make dropping encryption a wise decision for everyone else.

FWIW 35 years IT experience here delivering commercial IT services, including email from it’s inception.

Crystal radio sets still work, but one would not recommend their continued use.

[#3]

I've not had any problems with my previous settings, so I'm not keen to mess with them!

For information, I'm currently using:

• IMAP: Server Name: imap.plus.net, Port 143, Connection security: None, Authentication: Password, transmitted insecurely
• SMTP: Server Name: relay.plus.net, Port 587, Authentication: Normal password, Security: STARTTLS
• My mobile device uses smtp,plus.net, for the latter

I'll go back and read the messages about security. Thank you.

[#4]

Using smtp.plus.net rather than the offical relay.plus.net will give rise to certificate mismatch warnings if encryption is set.

Not using encryption is not a wise choice: however if your software is obsolete and does not support current TLS standards then you might not have any other choice if you’re unwilling to purchase updated versions.

[#5]

Thank you - I'll look into both of those.

I was intrigued to see, on my first look at the Greenby webmail, that my All Mailboxes reports "Used 252 MB of 2GB". That is clearly just my Inbox. RoundCube reports folder sizes that match those in Thunderbird.

For years, I have run close to 800MB total and regularly used an imapsync script to move emails older than 15 months to another account, so it's nice to have more space. 

I'll monitor behaviour and have a look at alternatives before I start paying £15pa in a couple of years, although it would save me changing my email address, and it's cheaper than the non-free options.