---
title: 'Greylisting Settings'
url: 'https://docs.danami.com/warden/settings/greylisting/greylisting-settings'
markdown: 'https://docs.danami.com/warden/settings/greylisting/greylisting-settings.md'
date: '2026-09-22'
description: 'Greylisting is recommended for advanced users only. See here for more information. Greylisting - greylisting Enable or disable server wide greylisting. Greylisting will tell the mail server to temporarily reject any email from a sender it does not recognize. If the mail is legitimate, the…'
taxonomy:
  category:
    - docs
  tag:
    - greylisting
---

[](#)  [ Basics ](https://docs.danami.com/warden/)     [ Settings ](https://docs.danami.com/warden/settings)     [ Greylisting ](https://docs.danami.com/warden/settings/greylisting)      Greylisting Settings    

# Greylisting Settings

> > > > > Greylisting is recommended for advanced users only. See [here](https://www.danami.com/clients/knowledgebase/113/How-can-I-configure-greylisting-with-Warden-Anti-spam-and-Virus-protection.html) for more information.

**Greylisting** - `greylisting`
Enable or disable server wide greylisting. Greylisting will tell the mail server to temporarily reject any email from a sender it does not recognize. If the mail is legitimate, the originating server will try again after a delay, and if sufficient time has elapsed, the email will be accepted.
Default: false

**Greylisting interval** - `grey_interval`
A period of time that a sender should wait for before retrying sending the mail (in minutes).
Default: 5

**Expire interval** - `expire_interval`
A period of time after which a record in grey list expires (in minutes). The default expire interval is 36 days.
Default: 51840

**Penalties** - `penalties`
Enable or disable penalties. Penalties are a period of time added to the grey interval in case a sender retried sending mail before the grey interval finished (in minutes).
Default: false

**Penalty interval** - `penalty_interval`
A period of time added to the grey interval in case a sender retried sending mail before the grey interval finished (in minutes).
Default: false

## Greylisting Whitelist

Whitelist a mail server from greylisting. Remember that you are whitelisting the remote hosts client rDNS record (PTR record) not an email address. Wildcard patterns are supported:

```
// whitelist a single mail server
mail.example.com

// whitelist all mail servers from a provider
*.example.com
```

## Greylisting Blacklist

Blacklist a mail server from greylisting. Emails that are blacklisted will be listed under Warden -> Logs -> Reject Log. Blacklisted entries will have the a `451 4.7.1` status with the message `Command rejected`.

```
// matches mta-70-12-15.sparkpostmail.com
*[0-9][0-9]-[0-9][0-9]-[0-9][0-9]*

// matches any of the following keywords in the remote host like mail25.static.mailgun.info
dynamic|static|ppp|dyn-ip|dial-up
```

---

## Navigation

- Parent: [Greylisting](https://docs.danami.com/warden/settings/greylisting.md)