Postgrey is a Postfix policy server implementing greylisting. When a request for delivery of a mail is received by Postfix via SMTP, the triplet CLIENT_IP / SENDER / RECIPIENT is built. If it is the first time that this triplet is seen, or if the triplet was first seen less than 5 minutes, then the mail gets rejected with a temporary error. Hopefully spammers or viruses will not try again later, as it is however required per RFC.
The following features compared with greylist.pl from Postfix 2.1.1 are new: Safe database, automatic maintenance, whitelists, lookup by subnet, auto-whitelisting of clients, only Berkeley DB and no large mysql nor postgresql DB needed.
| Package Version | Update ID | Released | Package Hub Version | Platforms | Subpackages |
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| 1.37-bp156.4.2 info | GA Release | 2024-03-04 | 15 SP6 |
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| 1.37-bp155.3.11 info | GA Release | 2023-05-22 | 15 SP5 |
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| 1.37-bp154.2.25 info | GA Release | 2022-05-12 | 15 SP4 |
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| 1.37-bp153.1.16 info | GA Release | 2021-03-13 | 15 SP3 |
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| 1.37-bp152.3.17 info | GA Release | 2020-04-16 | 15 SP2 |
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| 1.37-bp151.3.1 info | GA Release | 2019-07-17 | 15 SP1 |
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| 1.37-bp151.2.12 info | GA Release | 2019-05-18 | 15 SP1 |
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| 1.37-bp150.2.4 info | GA Release | 2018-07-30 | 15 |
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