Emails being sent to NC contacts has recipient's email address duplicated in display-name

[mjog]

Steps to reproduce

1. Send an email to a NC contact selected via autocomplete, e.g. Test Contact that has email address [email protected]
2. View the source of the email that was sent
3. Observe the To header value

Expected behavior

The To header has value "Test Contact" <[email protected]> and hence does to trigger Display Name spoofing attack mitigations.

Actual behavior

The To header has value "Test Contact ([email protected])" <[email protected]>, which triggers Display Name spoofing attack mitigations.

Mail app version

4.1.1

Nextcloud version

30.0.4

Mailserver or service

Postfix + Dovecot

Operating system

Linux

PHP engine version

PHP 8.2

Nextcloud memory caching

N/A

Web server

Apache (supported)

Database

MariaDB

Additional info

No response

[mjog]

Oh, just to be clear, I'm not sure if NC Mail itself implements any Display Name spoofing attack mitigations (if not, it should), but the mitigations I am talking about being triggered by t his behaviour are in other MTAs/MUAs.