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Re: manage blocked and greylisted IPs
From: Mark Goodge <mark_at_nospam>Date: Thu Nov 11 2010 - 15:11:42 GMT
To: postfix-users@postfix.org
On 11/11/2010 14:56, Jeroen Geilman wrote:
> On 11/11/2010 03:14 PM, Pedro Axelrud wrote:
>> Hello guys,
>>
>> We have a startup with an email marketing web app, we are very rigid
>> with our clients to not allow spammers.
>> One of our client's wants to send a message to two million contacts
>
> HOW will they be sending these messages ?
> That's the most important factor.
> If they try to maildrop 2M messages (or 2000 messages with 1000
> recipients each) into your postfix server, without consultation with
> you, things will get hairy.
> If they wish to send a bulk mail to 2M recipients, you probably want to
> tell them to implement a steady delivery mechanism on their end.
>
> There's several ways that can go; you could require that they spread out
> destinations over multiple messages, to spread the concurrency load.
> Or the exact opposite: require them to group recipients by domain into
> separate messages, so you can take advantage of the fact that postfix
> will also deliver them as one message.
>
> The right solution will probably be somewhere in the middle; but it
> won't require you to process and queue 2 million messages.
> It should be perfectly doable with about 20000 messages or so, each with
> 100 recipients.
If they're running a legitimate and properly managed opt-in mailing list
then every message will have one, and only one, recipient, as it will
contain both individual unsubscribe details for that subscriber and
header tracking to ensure that they can identify any subscriber who
mistakenly reports it as spam to their ISP or where any message bounces.
So yes, they're going to have to send 2 million messages. There's no
practical way round that. And if they're not following best practice for
opt-in mailing lists (including bounce tracking and individual opt-out
links), then the OP shouldn't be letting them use his mail servers as
otherwise, he's going to be the one getting the spam complaints.
Mark
--
http://mark.goodge.co.uk