BUG: when failed to send message to a single or more users reports as error, when should be warning

[albjeremias]

Delta Chat version: 1.50.3

Expected behavior:

I expect that when a message in a chat fails to send, should give a warning sign and a more explicit message of what is the issue like: "Message failed to deliver to user Bob, Alice" and show a yellow warning sign in the corner of the message instead of a red.

Actual behavior:

When it fails to send a message to a single or multiple users it shows a long message saying:

Error:
Undelivered Mail Returned to Sender – This is the mail system at host ____.org.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

[bob@____.org](https://github.com/deltachat/deltachat-android/issues/new?assignees=&labels=bug&projects=&template=bug_report.md&title=#): host ____.org[private/dovecot-lmtp] said:
    552 5.2.2 [bob@____.org](https://github.com/deltachat/deltachat-android/issues/new?assignees=&labels=bug&projects=&template=bug_report.md&title=#) Quota exceeded (mailbox for user is
    full) (in reply to end of DATA command)

[alice@____.org.org](https://github.com/deltachat/deltachat-android/issues/new?assignees=&labels=bug&projects=&template=bug_report.md&title=#): host ____.org.org[private/dovecot-lmtp] said:
    552 5.2.2 [alice@____.org](https://github.com/deltachat/deltachat-android/issues/new?assignees=&labels=bug&projects=&template=bug_report.md&title=#) Quota exceeded (mailbox for user is
    full) (in reply to end of DATA command)

Steps to reproduce the problem:

fill a mailbox quota of a user in a group... send a message.

Screenshots:

[Gh0stz0x]

I don't think it's a bug, but a feature request.
I know the error message can be cryptic since not everyone knows what the words used mean.
As for the color of the warning, it's a personal taste.
I think you can immediately notice that something is wrong with the current color.