My question is general, more for best practices.
I have an Exchange 2003 server configured to receive email for 2 email domains.
Half of my users send out as ants.com the other half as spiders.com, meaning this is their primary email address and the reply to address.
The server has a single Virtual SMTP Server and sends outbound email via Postini Smart Host. Postini knows about both domains as well.
I have a PTR created with the ISP for the serves external IP = mail.ants.com. Ants.com also has an SPF record created. Spiders.com has no SPF record (yet, I'll create one soon)
The spider.com users seem to have trouble sending email from time to time. I'm wondering if I should change the way this is configured. Maybe make a Virtual SMTP Server for each of the email domains?
Thanks for your thoughts!