[pmontra]

You could have solved the second problem by storing the email with the login and password in a password manager. Maybe they were not a thing yet when you started this experiment.

The third problem is more serious. I use Thunderbird. I googled and there are a couple of addons that makes it easy to edit the from address without having to create new Thunderbird identities.

https://github.com/absorb-it/Virtual-Identity

https://freeshell.de//~kaosmos/index-en.html#editsender

Both are somewhat unsafe, one because of the site certificate, the other because of the download site.

The first problem looks like a showstopper tough.

[garaetjjte]

Why you need addons for it? Thunderbird allows to change From address by default. ("customize address" in identity combobox)

[pmontra]

I never noticed that, thanks. I googled and found it's there since Thunderbird 45, April 12, 2016.

[Sohcahtoa82]

Yeah, I started this back in 2003. I imagine password managers existed back then, but they certainly weren't as common.

These days I don't even use Thunderbird. I just have gmail retrieve all my e-mail from my POP3 server. Though FWIW, I still have Thunderbird installed with all my e-mail going back to 2003. I imagine there's a way I could capture every e-mail address I've used then manually go to each web site and change my registered e-mail address.

[turbohedgehog]

https://addons.mozilla.org/en-US/thunderbird/addon/correct-i...

This is the one I use.