[horde] Spam

[Larry Weldon]

On 8/29/2016 3:15 PM, Simon B wrote:
> On 29 Aug 2016 21:00, "PAC" <paulcop68 at thecoppingers.net> wrote:
>> I'm currently being swamped with about 100 spam emails a day. I have the
> spam- level filter set at ***** but Horde is not catching very many.  Many
> spam emails come from an address with .top for the final extension. I have
> built a filters trying to use * to represent the address,I. E., *@*.*.top,
> *@*.top and even just *.top. So far, this has not worked. Can the * be used
> as a substitution for the changing portions of these spam addresses?
>> I'm not sure of what Horde my ISP is using. My ISP is Host Excellence.  I
> primarily use my iPhone to view email using Apple Mail via IMAP.
>> Any help controlling my spam problem would be appreciated.
> You should address this with host excellence.. Spam controls are best done
> on the MTA (mail transfer agent), either rejection, quarantine or tagging.
> Tagging is then used by the MDA (mail delivery agent) to filter the spam
> for you.  Using the client (in your case Horde) is a very 90s solution.
>
> The problem is the .top domain you're trying to filter is probably only the
> displayed address and not the real address.  If you can supply full headers
> for a problem mail, someone can advise you, but this is really your ISP's
> problem to solve.
>
> Simon

I recently had this problem with a client system. The Received: from 
header was showing the xxxx.top domain but the reverse DNS was

[ unknown (xxx.xxx.xxx.xxx)] - I set a Postfix filter to add

   # Don't accept mail from domains that don't exist.
     smtpd_sender_restrictions 
<http://www.postfix.org/postconf.5.html#smtpd_sender_restrictions>  =reject_unknown_sender_domain 
<http://www.postfix.org/postconf.5.html#reject_unknown_sender_domain>

This disallows all those emails without a reverse DNS.

Your ISP has to create this block.

Larry