Description

Plesk's greylisting functionality has a built-in pre-set whitelist, however it only whitelists a few public SMTP servers. This script pulls in a public whitelist and uses our/your own configuration in the custom_domains file, adding each to the Plesk greylisting whitelist

Public whitelist source

The public whitelist comes from combined_rspamd_domains found here: https://whitelist.maven-group.org/

Usage

You probably want to edit the first domain entry at the top of the custom_domains file such that websavers.ca is replaced with the domain your SMTP server(s) use. Then run: ./plesk_add_to_greylist_whitelist.sh

Note: As long as the domain syntax doesn't change when running plesk bin grey_listing then you can run this script repeatedly and Plesk will only add new records. (As, for example, *.websavers.ca is different from *websavers.ca)

Customization

You may wish to customize by adding your own entries to the whitelist. We analyze our server mail logs for 451 errors like this: grep "451 4.7.1" /var/log/maillog | more And use the results to find common legit mail servers to whitelist by adding to the custom_domains file. If you don't use that custom_domains file, our default file will be retrieved with wget and used instead.

Requirements

• Plesk Onyx 17.x minimum (might work with Plesk 12.5. Untested.)
• curl

Reference

• Public Whitelist: https://whitelist.maven-group.org/
• Plesk Greylisting Docs: https://support.plesk.com/hc/en-us/articles/213394809-How-to-configure-Greylisting-
• Plesk Syntax Ref: https://support.plesk.com/hc/en-us/articles/214028429-Greylisting-defers-all-emails-from-Office-365-accounts
• Add entry to whitelist: plesk bin grey_listing --update-server -domains-whitelist add:MAILPPPPT02.example-mail.com
• List current whitelist entries: plesk bin grey_listing --info-server