msmtp freezed

[debecio]

Hello, it is a little OT question. Since month when I send mail with msmtp 
sometimes (not always) msmtp block on sending. I left for hours the process 
work but nothing, none errors in log or in mutt but it stay blocked on sending. 
If i kill process and send mail again it work. I seek a way to have much 
verbose log but there is not options for this in .msmrprc file and if I change 
in muttrc "/usr/bin/msmtp" with "/usr/bin/msmtp -v" (verbose) do nothing.
Thanks