Feedback of failure after sending test email is poor

[krichter722]

After a failure of sending a test email the feedback is A problem occurred while sending the email. Please revise your settings.. It'd be useful to provide the reason for the failure in a dialog and/or (and preferred) a link to the log file containing the detailed error message and the reason.

[LukasReschke]

Will be fixed with ownCloud 8.1:

core/settings/controller/mailsettingscontroller.php

Lines 158 to 160 in a968b84

	'data' => [
	'message' => (string) $this->l10n->t('A problem occurred while sending the email. Please revise your settings. (Error: %s)', [$e->getMessage()]),
	],

[vandijkstef]

Would be great if the test email contains the transport method. I can image more people just hitting all three and see which will come trough. At least I did.