Yes, have a look at the file /var/log/qmail/current and should be able to see if the remote server did accept your email or not at all
it give me this
2017-10-12 08:43:41.500438500 new msg 46403334
2017-10-12 08:43:41.500440500 info msg 46403334: bytes 3215 from <ahmedsaloom@altawi.com.sa> qp 24571 uid 453
2017-10-12 08:43:41.550386500 starting delivery 3031: msg 46403334 to remote saloum77@gmail.com
2017-10-12 08:43:41.550389500 status: local 0/20 remote 1/20
2017-10-12 08:43:43.814133500 delivery 3031: success: 64.233.184.27_accepted_message./Remote_host_said:_250_2.0.0_OK_1507812223_a6si3779562wrh.292_-_gsmtp/
2017-10-12 08:43:43.814137500 status: local 0/20 remote 0/20
2017-10-12 08:43:43.814138500 end msg 46403334