Auto-Submitted and Precedence headers in automatically sent e-mails

[slater0013]

Is your feature request related to a problem? Please describe.
Emails are often automatically sent by Nextcloud. eg : activity or sharing notifications. People with auto-reply configured on their mailboxes reply...

Describe the solution you'd like
Two additionnal headers can be added in automatically submited emails, as described in RFC.
Auto-Submitted and Precedence. RFC-compliant mail clients may not autoreply when those headers are present.

Thank you,
GS.

[kesselb]

Sounds good 👍

Here is the related RFC: https://tools.ietf.org/html/rfc3834 and https://tools.ietf.org/html/rfc5436

[slater0013]

AFAIUnderstand....

Based on https://swiftmailer.symfony.com/docs/headers.html#text-headers

File lib/private/Mail/Mailer.php around line 191:

$headers = $message->getSwiftMessage()->getHeaders();
$headers->addTextHeader('Auto-Submitted', 'auto-generated');

And... That's it ! Or implementing the getHeaders() function in lib/private/Mail/Message.php

Tested in my Nextcloud test instance, works like a charm ! Auto-Submitted header is added to the sent mails (Test e-mail from Admin pannel)

GS.

[szaimen]

Thanks @slater0013! Would you be able to create a PR for this? That would be really great! :)

[slater0013]

Ok I ... tried something :)
#27200

[szaimen]

Great, thank you! :)