What is the best antispam for Zimbra?

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Klug
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Re: What is the best antispam for Zimbra?

Postby Klug » Fri Nov 06, 2020 4:06 pm

erme wrote:have look to Proxmox PMG, https://www.proxmox.com/en/proxmox-mail-gateway

It relies on the VRFY command for the callout.
I remember someone asked about it a couple of weeks ago because there a issues with it (Zeta weekly calls) but I don't think I read how he fixed his issues (and if the fix survives upgrades).

If you want JUST antispam and on-premise, you can have a look at MailCleaner.
Both Community Edition (free, needs manual tuning such as adding ClamSpam and RBLs and URIBLs) and Entreprise Edition (paid) are not bad at filtering spams.

If you want advanced security filtering (against spams but mostly phishing attempts, spear-phishing attempts and malwares), IMHO the best solution is Vade Secure.
It's not free but definitively the best solution we tested.
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DavidMerrill
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Re: What is the best antispam for Zimbra?

Postby DavidMerrill » Sun Nov 08, 2020 3:10 am

Klug wrote:
erme wrote:have look to Proxmox PMG, https://www.proxmox.com/en/proxmox-mail-gateway

It relies on the VRFY command for the callout.
I remember someone asked about it a couple of weeks ago because there a issues with it (Zeta weekly calls) but I don't think I read how he fixed his issues (and if the fix survives upgrades).


You may be referring to me. I had issues with getting VRFY's (Proxmox verifying recipients against the destination Zinbra server) to work against alias-domains (VRFY's against non-alias domains were fine). The fix was to set the following:

Code: Select all

zmprov mcf zimbraMtaSmtpdRejectUnlistedRecipient yes
zmprov mcf zimbraMtaEnableSmtpdPolicyd TRUE
zmprov mcf +zimbraMtaRestriction "check_policy_service unix:private/policy"
___________________________________
David Merrill - Zimbra Practice Lead
OTELCO Zimbra Hosting, Licensing and Professional Services
Zeta Alliance
Klug
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Re: What is the best antispam for Zimbra?

Postby Klug » Mon Nov 09, 2020 11:53 am

That was you. Thank you for the solution.
danielb
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Re: What is the best antispam for Zimbra?

Postby danielb » Fri Nov 20, 2020 12:19 pm

DavidMerrill wrote:
Klug wrote:
erme wrote:have look to Proxmox PMG, https://www.proxmox.com/en/proxmox-mail-gateway

Code: Select all

zmprov mcf zimbraMtaSmtpdRejectUnlistedRecipient yes
zmprov mcf zimbraMtaEnableSmtpdPolicyd TRUE
zmprov mcf +zimbraMtaRestriction "check_policy_service unix:private/policy"


I tried this solution, and while it does work for explicit email with domain aliases, it breaks extensions email. Eg my main mail is dani@example.org. I can use dani-anything@example.org or dani+another@example.org. All those addresses are correctly working on the main domain. But with policyd enabled, those adresses are rejected on domain aliases ...

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