[Mailman-Users] Best way to slow down all the spam to my lists?

[Keith Seyffarth]

Grant Taylor via Mailman-Users <mailman-users at python.org> writes:

> On 12/13/19 9:02 PM, Mark Sapiro wrote:
>> As postgrey learns, it will remember triplets (sender, sending IP, 
>> recipient) and not delay them and in addition will whitelist domains 
>> that retry successfully more than a few times.
>
> The bigger senders are doing things now (more than ever) that they 
> weren't doing 15+ years ago.  Now farms of servers will try to contact 
> you.  The message may first try from one IP, then from another IP, then 
> from a 3rd....  It may eventually try from the same IP and make it through.
>
> I think most grey list solutions have an option to specify the network 
> (frequently configured a a /24) for the sending IP.  This significantly 
> helps with different servers in the same server farm trying to resend 
> messages.

Some greylisting solutions also allow you to whitelist a domain or
subdomain, but this can result in spammers spoofing that domain getting
through...

Keith


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Keith Seyffarth
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