[SOLVED] How to block junk from my own email address ?

[epok]

Dear Zimbra community,

Many junk use email addresses of my own domains and Zimbra move it in junk folder.
There is however a little problem, some of emails was really sent by a user are move in junk folder.

Is it possible to make a distinction between real user and junker ?

Maybe by authentification, IP, SSL.... ?

I hope that my explanation is sufficiently clear... I'm sorry for my poor english.

Thanks in advance


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Zimbra 5.0.16 NE

[uxbod]

If they are spoofing your domain name, and it is a valid email address, then it will let it through. Are you using a catch all address at all ? Do you perform MX lookup checks at all ? SPF ? Domain Sigs ?

[veronica]

Might also be backstacker mails

[uxbod]

Could be backscatter; it would depend on whether they are NDRs or OoO messages. Would need to see the headers as you have already asked for Veronica.

[epok]

I have just set up the SPF and obviously that will regulate my problem...

thank you very much for your assistance.

[uxbod]

You may wish to beef up your AS protection aswell; so here are a couple of things to read through :-

Improving Anti-spam system - Zimbra :: Wiki
[SOLVED] SaneSecurity ClamAV or FuzzyOCR SpamAssassin Plugins
BarracudaCentral.org - Technical Insight for Security Pros
Sanesecurity's ClamAV - Phishing and Scam/Spam Signatures

[epok]

Tanks for links I will read that attentively