[scarface_74]

When you give your mail client credentials to read your email , would you not expect your client to be able to read your mail?

On Android, when you give a third party client permission to receive SMS, you don’t expect it to have access to your SMS?

[SoDmbIHadToRply]

So when I give thunderbird my email details, someone at thunderbird gets access to all my emails ?

[rezonant]

If Thunderbird had a hosted web version, yes. Are you arguing that data portability and interoperability should never be possible if the receiving app is an online service?

Of course Thunderbird could send an automatic update that starts shipping your emails to Thunderbird's servers. You dont expect that, but only because you trust them.

[sashank_1509]

unless I’m wrong thunderbird software has complete access to all your emails when you give thunderbird your email details. Of course, that does not imply that a specific thunderbird employee can read your emails, it is probably encrypted on that end but if they pull a switcheroo and download all your emails into an AWS instance, yes that might be possible (and probably wildly illegal too)