At least in Claws Mail 3.7.8 (and back to 3.7.6), interrupted networking during IMAP activity can lead to a segfault. Either automatically or when the user tries to close Claws Mail, which appears to have freezed due to the IMAP connection troubles. Backtraces: https://bugzilla.redhat.com/attachment.cgi?id=486255 https://bugzilla.redhat.com/attachment.cgi?id=434237 ( more in the duplicates linked at https://bugzilla.redhat.com/617985 )
Closing in favour of bug 2769 and due to the comments in bug 3084.