What does the qmail/current log file show? That should at least give you a clue on where the issue is.
thanks, but Where would I check that?
View Log Files -> qmail/current
I see that it is still using my old exchange server
2021-03-01 11:31:59.067381500 new msg 1594110
2021-03-01 11:31:59.067464500 info msg 1594110: bytes 364880 from <donotreply@int.domain.org> qp 29614 uid 453
2021-03-01 11:31:59.069955500 starting delivery 20064: msg 1594110 to remote user@int.domain.org
2021-03-01 11:31:59.069957500 status: local 0/10 remote 1/20
2021-03-01 11:31:59.495734500 delivery 20064: success: 127.0.0.1_accepted_message./Remote_host_said:_250_2.6.0_<af17bc9e522c4cd8b5ee79201dffbfd7@MAIL1.int.domain.orgg>_[InternalId=2774548873328,_Hostname=MAIL-02.int.domain.org]_372373_bytes_in_0.336,_1082.049_KB/sec_Queued_mail_for_delivery/
2021-03-01 11:31:59.495894500 status: local 0/10 remote 0/20
2021-03-01 11:31:59.495895500 end msg 1594110