O Reverse Mapping PTRs

Keeping a reverse mapping of all your exposed IP addresses and main systems is important. Even if you can't or don't want to assign names to your network, you can use standardized names like pool-250.domain.com.

Additionally, you should ensure that the direct resolution of your names matches the reverse resolution of their respective IP addresses.

These practices, aside from being polite to your peers, facilitate debugging and (especially with mail servers) decrease scoring in SPAM checks, which treats missing reverse addresses and mismatches as likely belonging to spammers.

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