Support email subadressing

[lunik1]

What feature is it?

Add a subaddress parameter to the Email route so that only mail delivered to that subadress is retrieved.

What problem does this feature solve?

This would allow using a single email account to provide several feeds, e.g. [email protected] and [email protected]. Currently each newsletter would require its own account and set of credentials, or the use of filters which are more limited (some newsletter titles change regularly or cannot be described by a regex).

Additional description

No response

This is not a duplicated feature request

• [X] I have searched existing issues to ensure this feature has not already been requested

[github-actions[bot]]

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