Blocking spoofed address

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manuns
Posts: 1
Joined: Tue May 22, 2018 7:13 am

Blocking spoofed address

Post by manuns »

How can i block email that are coming from fake emailer like emkei.cz to my domain. By using emkei.cz we can send email from abc@example.com to def@example.com 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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stefaniu.criste
Posts: 41
Joined: Wed Feb 12, 2014 5:40 am
Location: Romania
ZCS/ZD Version: 8.8.8_GA_1728 20180614052922 201806
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Re: Blocking spoofed address

Post by stefaniu.criste »

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)
Stefaniu Criste - managing partner
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