Suggest recipients from existing messages

[BiglifeMatt]

Steps to reproduce

1. Create a new message
2. Start typing email address or username of a person that sent you an email or you have frequently corresponded with that is not in a contact list in Nextcloud.
3. No result or option will show for anyone not in a Contact list or local LDAP domain.

Expected behavior

I would expect the index to account for email addresses that are collected just in the inbox as options along side the Nextcloud Contacts.

Actual behavior

Only Nextcloud contacts are available unless you know the recipients full email address and type it completely.

Mail app version

3.7.6

Mailserver or service

dovecot

Operating system

Ubuntu 22.04

PHP engine version

PHP 8.1

Web server

Apache (supported)

Database

MySQL

Additional info

No response