The gateway is receiving for all, then sending to Imail, Imail rejects and gateway tries to send bounce.
This is suicidal for the gateway (dictionary attack or just normal background noise) will keep the gateways outbound queue swamped with crap, perhaps to DoS levels.
The MX absolutely must not accept any mail for unknown recipients. If the MX can't do that, change to an MX that can.
This is also the weakness of letting 3rd AV products listen on port 25. afaik, none of them are "recipient aware".
Len
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