Bulk Email Speed
You want to send an email to your contacts and you
want to buy a bulk email software, but you wonder
how fast can you send bulk email? Software
vendors claim their programs to be exceptionally fast.
But will they hold up?
There is no short answer to the question.
Sending email involves at least
three distinct components:
Bulk email software which transmits
your messages to SMTP servers.
SMTP server software which receives
Network connection between them which
determines how fast and reliable is the data transfer.
Each of these components contributes to the overall speed
of the sending. Any of the components has the potential to
slow the things down to the point where sending bulk email
is absolutely impossible.
Bulk Email Software
Given fast connection and ideal fast no-delay SMTP server,
bulk email software can transmit messages extremely fast.
In our bulk email speed test we
found out that AY Mail 2 Corporate Edition
is capable of transferring 40 million
or 2.75 million
personalized messages per hour. That is
amazing. That means that 10,000 personalized messages will be
sent in under 15 seconds. You don't need anything faster than
Unfortunately, in the real world, Internet connections are
not so fast, and SMTP servers are not ideal. You're unlikely
to get even close to that speed.
The important point is that bulk email software rarely
is a bottleneck that determines the speed of the whole process.
If you want to estimate the speed, you need to look at the
SMTP server and the connection.
When the server receives messages from bulk email program,
all it needs to do is to save it, so that it could forward it
to the destination when time comes. This doesn't take very long
and it shouldn't slow down the process.
Unfortunately, email transport is heavily abused by
irresponsible advertisers, so mail servers not just accept
messages, they verify the validity of each recipient -
is the recipient's domain valid, is server allowed to rely
to the recipient? All these checks take time.
SMTP servers include delays intentionally. Small delays
will not hurt single emails, but they will make
impossible to move a large mailing through such server.
If you send a message to 10,000 recipients, even a small
0.01 sec delay will add up to 1 min 40 sec, thus slowing
the speed of transmission 6 times! A typical 0.1 sec delay
will take 17 minutes. 1 sec delays will make the mailing slow
- you'll have to wait nearly 3 hours until the message is
One of the ways to fight the delays is multi-threading.
While the server is busy checking on a recipient, why not
to establish a separate connection to move other messages?
Unfortunately, most servers will not accept multiple
connections while others will not work well in this mode.
One way to avoid server delays is
direct send. Each message is sent to its own server.
In this mode, you can benefit from multithreading.
The connection speed is critical. According to our
bulk email speed test, it
takes 15 seconds to transfer 10,000 personalized messages
within a computer, but it takes 5 times longer to do
that over local network, and it takes over 8 hours with
a modem. Server delays mean nothing compared to such
a waste of time.
Slow modem connection may make it impractical to send
personalized messages. Waiting 8 or 9 ours while your
10,000 messages are being transferred sounds like a
torture. Sending non-personalized mail messages will
take just slightly over an hour.
AY Mail's turbo mode
is capable of speeding up non-personalized sending
a lot. 10,000 messages can be transferred in less
than 2 minutes using slow modem line! At this transfer
speed, server delays may become more important than
The computer where you run your bulk email software
does not have to be fast. The speed of the computer
matters only if the connection speed is very high.
bulk email speed test conducted
over Ethernet, 2GHz computer gave only 21% gain in
transmission speed compared to slower 550MHz
After mail is sent
Transferring email to the server does not mean delivering
it to the destination recipients. With large mailings, it may
take hours for the server to send everything out.