Martin Waschbuesch ha scritto:
Hi,
I happen to work in E-Marketing, so here's my five cents (hope it's helpful!)...
What I am going to say ASSUMES that highest possible deliverability is what you
are after.
Am 05.07.2010 um 16:12 schrieb Tonix (Antonio Nati):
Main problem I see is related to qmail opening a new session for each outgoing
email.
Yahoo and others see hundreds of parallel sessions opened all together from the
same IP, so they close new connections from that IP, because they feel to be
attacked.
We need a mechanism to send several e-mails using the same connection.
Tonino
That in itself would not be a solution at all, I am afraid. A lot of ISPs
actually limit (on purpose) the amount of messages they accept per connection
plus the number of connections within given time plus the number of concurrent
connections.
You would need, and indeed major Email Service Providers have that at least for
the major ISPs, one configuration profile per ISP to achieve ideal performance
and deliverability. These profiles are not stable - ISPs often change them
(without publicly broadcasting the fact) to throw off spammers.
But it is worse than that. New (from the standpoint of the ISP) senders have to
train or 'seed' their IP. That is to say: achieve a consistent mailing
frequency (number of mailings per timeframe), mailing size (recipients per
mailing), bounce rates (there should never be spikes in your hard bounces, e.g.
550 type errors) and last but not least complaint rate (which should be next to
non-existant if you want good deliverability). Complaint rate means if someone
in e.g. AOL marks a mail and clicks the 'This is spam' type button.
Some of the checks ISPs make are automatic. They just monitor traffic and if
there are spikes or 'irregular' behavior, your bandwidth gets limited, mails
bounced, you name it.
Also, no matter how you acquired the emails you HAVE to remove hard-bounces and
not retry sending to them again. Codes / Messages vary from ISP to ISP.
Last but not least it is very tedious to communicate with ISPs should you land
on a blocklist (plus there are some public blocklists where you can never get
removed)
I am very confident that qmail can handle all of this volume-wise, but it lacks
the proper tools to fine-tune for Deliverability as well as automated bounce
and complaint management that are required to achieve results comparable to
professional senders.
I attached the latest forrester research results I have on the topic of
emarketing vendors and would suggest you give that a thought.
Again, this is only if your main concern is Deliverability.
I agree with you, but I find this qmail limit not acceptable. Even
speaking about 600 e-mails to the same domain we have problems, as qmail
is going to open 600 connections and the most of big ISP close
connections after they got the first 100 in a few seconds.
When this limit will be eliminated, we can speak about further limits.
Tonino
Cheers,
Martin
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