1680220 - select sender identity based on the recipient address (domain fencing)

Status: UNCONFIRMED

(Thunderbird :: Message Compose Window, enhancement)

Description

[carbon]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:83.0) Gecko/20100101 Firefox/83.0

Steps to reproduce:

Let's say, my default identity is [e-mail] so this is what is set as sender when composing mails.
When composing an email to the recipient [e-mail] the mail would get sent with my default identity, which is unwanted in this case.

Actual results:

The user has to watch carefully, that the correct identity is set and select manually when needed. This is a potential reason for errors.

Expected results:

Thunderbird should be capable of selecting the used identity based on the recipient. If multiple identities / mail addresses are configured, it's important to not mix up e.g. work and private communication.

Example:

• When composing a mail to the recipient [e-mail] my sender identity should automatically switch to [e-mail]
• When composing a mail to the recipient [e-mail] my sender identity should always automatically switch to [e-mail]
• ...

This was already available in two add-ons which were abandoned (due to the technical changes made to the current Thunderbird platform):
• Correct Identity https://addons.thunderbird.net/en-US/thunderbird/addon/correct-identity/
• Flexible Identity https://addons.thunderbird.net/en-US/thunderbird/addon/flexible-identity/
This functionality is imo too important to make it dependent on external add-on developers and should be implemented directly into Thunderbird.