Recipients addresses appearing since upgrade

[Wayne]

A serious situation has arisen since upgrading to Mailscanner 4,55 
the following details are being added
to our mailing list postings: Example ....

>>X-Balita-MailScanner-To: aalicant at sakentz.com, acarpio at us.imshealth.com,
>>         adangoy at voyageur.ca, alablues at otelco.net, alingdolly at yahoo.com,
>>         almazan at uplink.net, alnoveloso at yahoo.com.au,
>>         alophoixus at ukonline.co.uk and so on ........

It is obvious the MailScanner upgrade has altered a setting that was 
not set before.

As a matter of urgency can someone tell me what it could be that 
needs altering back to its original state.

Many thanks

Wayne