We have subscribed to an anti-spam service (mail-filters.com) and we want to set our server so that it ONLY allows SMTP conversations with the Mail-Filters servers (thus denying spammers from dropping spam directly on our server.)
The one How-To I've found on this site("How to restrict access to the SMTP server" by Darrel May) is for version 5.1 and it appears to be totally different from the way our 5.6 server is set up.
Can someone help me?
Thanks!
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