Frage: problem with apple mail on high sierra
i have a mid 2010 mac pro with high sierra installed. since a few days apple mail gives problems. anytime i send an email it opens the window which appears when a server is unavailable. however, the email was already successfully sent and the email with the problem window is entirely empty. it is a huge annoyance in my workflow. the problem i get is that the receipient is not specified.
can anybody help? i already deactivated an reactivated all email accounts and reindexed them...
Mac Pro, iOS 11.2.6, Mail