Missing warning before sending to many recipients

[ChristophWurst]

Steps to reproduce

1. Send a message to 11 people

Expected behavior

The app warns that the message will go to lots of recipients thanks to #4838.

Actual behavior

The app just sends without confirmation.

Mail app version

v1.12.0

Mailserver or service

No response

Operating system

No response

PHP engine version

No response

Web server

No response

Database

No response

Additional info

Regression of #6031

[wriver4]

In the discussion of email warning for too many, you mentioned 11. I was sending an email using 12 people in the TO: field, and the first one on the mail list did not get sent and errored out. It was stuck in the outbox. Sent email to the same account, and they were successful, did not get stuck in the outbox.

[miaulalala]

Since the send action is divorced from the message creation, at which point should the error be displayed?

[ChristophWurst]

For better UX I'd say when the message is added to the outbox

[ChristophWurst]

Label dropped because it was a duplicate of the attribute at https://github.com/orgs/nextcloud/projects/61. The priority does not change.

[miaulalala]

On converting a draft to an Outbox message the converting should fail if there's too many recipients and allow a force send option.