I'm getting the following error below when I send a message to one of vendors. The message sends back an auto-reply from [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]> which from what I've seen can't be validated when postfix does sender address validation probe. Has anyone seen this message before and how do I resolve the issue.
smtpd[25253]: NOQUEUE: reject: RCPT from mailgw1.per-se.com[199.190.235.46]: 450 4.1.8 <[EMAIL PROTECTED]>: Sender address rejected: Domain not found; from=<[EMAIL PROTECTED]> to=<[EMAIL PROTECTED]> proto=ESMTP helo=<mailgw1.per-se.com>
