Manage wildcard auth when sending emails

[lebouquetin]

See https://community.galae.net/ui/workspaces/1/contents/thread/2979 (FR)

Situation

Currently

• galae allows automatic + aliases in both reception and sending:
  • you can send from user@domain.tln account using a from address like user+someresource@domain.tld
  • you can receive to user@domain.tln account emails sent to user+someresource@domain.tld
• galae allows automatic .* wildcard aliases in reception:
  • you can receive to user@domain.tld account emails sent to someadresse.anyresource@domain.tld (you need to define a wildcard alias on domain)
• you cannot send as someadresse.anyresource@domain.tld

Expected

Being able to send as a random (wildcard matching) address.

Workaround

Allow user to send for the entire domain. In this case, the from address is not checked. Unfortunately, this is a domain-wide parameter, so all users would be able to send for anybody.

Difficulties

A consistent behavior would be to allow the recipient of a wildcard to send « as the wildcard »

Example:

Imagine I setup a wildcard project*@domain.tld which redirect messages to team@domain.tld. This is a domain level configuration

All emails sent to projectX@domain.tld or projectY@domain.tld will be redirect to team@domain.tld mailbox. That would be nice to be able to send as projectX@domain.tld when loggedin as team@domain.tld.

Unfortunately, in the wildcard alias definition, there is no explicit relation between the team@domain.tln account and the alias address itself. Even more, team@domain.tln may be an alias to a series of mailboxes or a remote email address like recipient@anotherdomain.tld.

Because of this, this would be quite difficult to setup send authorization for user account that match the alias recipient address.