I've been under the impression that qmail always sends out emails
individually. DJB had a thing about multiple recipients, and rightly so
(if some are undeliverable and some are not, there's no good way of
handling the invalid addresses). In the long run, they all go out
separately anyway. You should verify this. I would expect that 500
recipients would result in 500 messages in the queue, whether they're
submitted together or separately.
Rajesh M wrote:
hi
a quick question
is it better to send to say 500 recipients (mailing list style) in a
single email or to send separately to each recipient which will leave a
small around (1/2 second) time gap between each email.
to send to 500 recipients using a mailing list method qmail will do it in
less than 30 seconds
if i send separately then it will be around 250 seconds for 500 emails
rajesh
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.
Cheers,
Martin
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