Max Concurrent Inbound Connections

Update ..

The issue does not appear to be at the remote end but another MTA in
another office that has a bunch of files in the MSHOLD folder of the MTA

When it tries to send them, this meesage is logged

The files are encrypted so it's hard to tell what they are.

Finally, If I change the link from Direct to Indirect and pass messages
through another (3rd) office, all works well - the messages process as
normal

Here's the log when the MTA's are connecting in Direct mode

18:29:02 31D MTP: HTS-SERVER-W: Transmitting file
oakville/sys:\grpwise\wb.dom\mslocal\mshold\mile742\4\00006 9db.001,
Size: 6532
18:29:03 313 MTP:
oakville/sys:\grpwise\wb.dom\mslocal\mshold\fbxf9e7\4\00006 8f3.001:
Send failed, error = [B305]
18:29:18 2F7 MTP: New receiver thread started, now 17 connections.
18:29:18 805 MTP: Miller_Domain: Accepting connection
18:29:18 805 MTP: Miller_Domain: Returning acknowledge (11)
18:29:22 31D MTP:
oakville/sys:\grpwise\wb.dom\mslocal\mshold\mile742\4\00006 9db.001:
Send failed, error = [B305]