Our transparent SMTP proxy skip list does not appear to be working for incoming email.
We are running in exchange hybrid mode as we migrate to Office 365. I have added all of the O365 IP address ranges to the skiplist. When a user sends an email from on-prem to O365 it works as expected. (the SMTP proxy doesn't intercept the traffic). However, when an O365 mailbox user sends to on-prem, the transparent SMTP proxy intercepts it, which breaks the headers so the email doesn't look like its an "internal" exchange email.
2016:08:17-10:33:13 asg-1 smtpd[30150]: SCANNER[30150]: 1ba1u5-0007qI-Lq <= REMOVED@REMOVED.com R=1ba1u3-0002Nk-2Q P=INPUT S=11800
2016:08:17-10:33:13 asg-1 smtpd[30150]: SCANNER[30150]: id="1000" severity="info" sys="SecureMail" sub="smtp" name="email passed" srcip="207.46.163.87" from="REMOVED@REMOVED.com" to="REMOVED@REMOVED.com" subject="Incoming Test" queueid="1ba1u5-0007qI-Lq" size="11800"
2016:08:17-10:33:14 asg-1 exim-out[9193]: 2016-08-17 10:33:14 1ba1u5-0007qI-Lq => REMOVED@REMOVED.com P=<REMOVED@REMOVED.com> R=static_route_hostlist T=static_smtp H=192.168.50.30 [192.168.50.30]:25 X=TLSv1:ECDHE-RSA-AES256-SHA:256 C="250 2.6.0 <DM2PR07MB685EA6A50246B624A5C61D684140@DM2PR07MB685.namprd07.prod.outlook.com> [InternalId"
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