Sometimes there are SMTP issues when sending messages:
The mail system
<bo7dfbqp1@nine.testrun.org>: host nine.testrun.org[private/dovecot-lmtp] said:
550 5.1.1 <bo7dfbqp1@nine.testrun.org> User doesn't exist:
bo7dfbqp1@nine.testrun.org (in reply to RCPT TO command)
Problem is that since DC removes focus from email addresses, it is hard to find that user in the list of contacts in big groups like the DC community.
Since DC knows that something went bad, maybe it can extract for which contact it went bad and show that in the message info box ?