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doc: a ip -> an ip (#3175)

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Co-authored-by: Casper <casperklein@users.noreply.github.com>
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Lin Han 2023-03-12 11:59:43 +00:00 committed by GitHub
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docs/content/config/best-practices/spf.md
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@ -34,7 +34,7 @@ In any case, increment the SPF record's TTL to its final value.
## Backup MX, Secondary MX
For whitelisting a IP Address from the SPF test, you can create a config file (see [`policyd-spf.conf`](https://www.linuxcertif.com/man/5/policyd-spf.conf)) and mount that file into `/etc/postfix-policyd-spf-python/policyd-spf.conf`.
For whitelisting an IP Address from the SPF test, you can create a config file (see [`policyd-spf.conf`](https://www.linuxcertif.com/man/5/policyd-spf.conf)) and mount that file into `/etc/postfix-policyd-spf-python/policyd-spf.conf`.
**Example:**