The new release of PowerMTA has below changes as to Port25 :
- fixed crash caused by not aborting a write operation for accounting data
when rotation to a new file fails with 'move-to' interval configured;
- fixed accounting file suffix resetting to zero during periods of
inactivity when 'move-to' is configured;
- fixed handling in some cases where recipient deliveries were being
postponed or would seem never attempted;
- optimized certain queue operations;
- additional fixes for SNMP daemon startup issues on 64-bit Windows;
- other enhancements in preparation for upcoming features;
