Reply to internet email appends our smtp domain

Hello,

When we reply to an internet email it appends our smtp Notes domain after the original senders address.

Example:

user@yahoo.com sends me an email.

When I reply it looks like user@yahoo.com@ourdomain

I would like to stop appending our domain if possible.

Subject: reply to internet email appends our smtp domain

We are seeing this following an upgrade to 8.5.2. We reply to mail in the Domino Web Access client and it appends @ourdomain to the address, attempts to route the mail internally and fails.

Has anyone seen/fixed this?