Sharing key notes & technical guides to deploy additional Postscreen daemon for ZCS 8.x (open source edition).
- Keeping the zombies/spambots away
- By keeping the zombies/spambots away, Postscreen leaves more SMTP server processes available for legitimate clients, and delays the onset of server overload conditions
- Postscreen is a daemon integrated in Postfix since version 2.8 and later
- The Postfix postscreen daemon provides additional protection against mail server overload
- For more details, go to the main page of Postscreen: http://www.postfix.org/POSTSCREEN_README.html
- Scenario in this project (anti-spam for Inbound SMTP traffic): Internet message(s) -> Postfix (running Postscreen) -> Zimbra Postfix (running built-in anti-spam/virus) -> Zimbra Mailbox
- Scenario in general: https://wiki.zimbra.com/wiki/Zimbra_Collaboration_Postscreen
- OS: CentOS 7.x, 64-bit
- Software:
- Zimbra: 8.6, 64-bit
- Postfix (not Zimbra Postfix): 2.10, 64-bit
- OS: CentOS 6.x or 7.x, 64-bit
- Software:
- Zimbra: 8.x, 64-bit
- Postfix (not Zimbra Postfix): >=2.8, 64-bit (recommended version: >=2.10)
- Postscreen daemon will be enabled in ZCS 8.7 by default
- In ZCS 8.6 and lower version, you have to build another Postscreen daemon running on same Zimbra MTA host or running on a separate host (Postfix)
See the license file "LICENSE" for more details.