Bugfixes in SMTP Gateway 5.6.0.1
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In case of temporary SMTP error (range 4xx, e.g. 422 mailbox full) there is 
 a retry every hour. If the error persists for 24 hours or longer, the 
 administrator (SG_MADEFU) is notified on every cycle. 
 After four days of unsuccessful retries the message is re-routed to the 
 administrator's account.
 Use SG_GWRTRY (minutes), SG_GWWARN (hours), SG_GWGIVUP (days) to configure
 these intervals.
 Permanent SMTP errors (range 5xx) are immediately routed to the administotor's
 account, as before.
Option SG_KEEPTMP=1 allows to inspect the temporary files involved in converting
 issues. Default is SG_KEEPTMP=0, no temporary files are left.
Outgoing messages with permanent errors are moved to OutgoingFailed folder.
 The mail administrator is notified.

The gateway generates RFC 3464 conforming non delivery reports also in case of 
 converting problems.
The daemon process removes any existing own header lines. Such headers result
 if you open a NDR and resend the message.

The gateway suppresses messages containg the header line Auto-Submitted, e.g. 
 Out of Office messages (RFC 3834).
The gateway does not send reports as fax, voice, or sms.
 Reports are of Content-Type: MULTIPART/REPORT. They should never get into 
 send queue.