Since I am using SMTPSVC from IIS to send all mail out I have noticed some domains that reject mail regarding LFs and similar SMTP day to day basis problems. So I mostly re route these domains by using smarthosts. Now I aslo read that on IIS7 or most of them when you add a remote domain to domains you must restart SMTPSVC to take effect.

I also enabled METABASE editing. So I also hoped that this will help me add remote domains on the fly. But it's not working.

Should I use another SMTP: -hmailserver or similar to route DOMAINS by smarthost.

We used a smarthost configuration before but ISP smarthost gets a lot on RBL Blacklist so mail comes back.

Since DNS MX direct sending is more work because of troublesome domains now I got more work to monitor SMTP logs.

Thank you in advance.