Spam Filtering for Mail Exchangers:
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Chapter 3. Considerations

Table of Contents
3.1. Multiple Incoming Mail Exchangers
3.2. Blocking Access to Other SMTP Servers
3.3. Forwarded Mail
3.4. User Settings and Data

Some specific considerations come into play as a result of system-wide SMTP time filtering. Here we cover some of those.

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Blocking Collateral Spam Multiple Incoming Mail Exchangers