🚀: allow non-local domain alias, add rcpt_alias variable

[helmut72]

Which feature or improvement would you like to request?

I'd like to see this feature:
Please add an option to allow alias addresses for users with domain part, that not exist in /manage/directory/domains.

LDAP directory create domains if the domain in email-alias isn't the one from the primary email address. To fulfill current behavior and different configurations, there should be also an option to create or not to create a domain, if the domain part in an alias isn't the one from the primary address.

For now, it's only possible to cheat in local user directory: First, create a 2nd domain "otherdomain.com", add an alias "[email protected]" to an user account and delete domain "otherdomain.com" afterwards. Alias won't be deleted from the user account.

Also it would be cool if Stalwart is aware of all users non-local domain aliases in a variable like rcpt_alias. This allow something like:
if is_local_address("", rcpt_alias) then 'local'

Is your feature request related to a problem?

I'm having a problem with...
#987 (comment)
#987 (comment)

This complete a feature that exist in Postfix. Thank you.

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