# Postgrey

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- Postfix

Postgrey can be used to enable greylisting for a Postfix mail server.

## Installation

Install the postgrey package. To get it running quickly edit the Postfix configuration file and add these lines:

    /etc/postfix/main.cf

    smtpd_recipient_restrictions =
      check_policy_service inet:127.0.0.1:10030

Then start/enable the `postgrey` service. Afterwards, reload the `postfix` service. Now greylisting should be enabled.

## Configuration

Configuration is done via editing the `greylist.service` file. First copy it over to edit it.

    # cp /usr/lib/systemd/system/postgrey.service /etc/systemd/system/

Now you can edit it. For example, to add automatic whitelisting (successful deliveries are whitelisted and don't have to wait any more), you could add the `--auto-whitelist-clients=N` option and replace `N` by a suitably small number (or leave it at its default of 5).

For a full documentation of possible options see `perldoc postgrey`.

Category:

- Mail server

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