Blocking spoofed address

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Blocking spoofed address

Postby manuns » Tue May 22, 2018 7:20 am

How can i block email that are coming from fake emailer like to my domain. By using we can send email from to without any authentication and this seems risk in upcoming days can. How can I prevent this in zimbra 8.6 opensource edition ???

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Location: Romania
ZCS/ZD Version: 8.8.8_GA_1728 20180614052922 201806

Re: Blocking spoofed address

Postby stefaniu.criste » Tue May 22, 2018 10:01 am

Two quick ideas (you need however to find their outgoing IPs)

- you could block their sending IPs at the firewall level (rough and brute)
- you can set a local RBL and add their IPs, as well as other nasty spammers (harder to implement, but very elegant)
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