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Payal Rathod
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 Posted: Tue Jun 21, 2005 11:02 pm Post subject: smtproutes |
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A small query about smtproutes.
I have : ip of isp in my control/smtproutes file.
Now if I send a 1Mb mail with 10 remote recipents, will there be 10 copies of the mails sent to my ISP or a single copy?
I am asking cos' I am seeing done for a few receipents in bin/qmail-qread output. I always thought it sends a single copy to my ISP and ISP makes the deliveries thus saving me bandwidth. |
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Steven
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| Posted: Tue Jun 21, 2005 11:05 pm Post subject: |
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Too bad djb isn't right here:
"Single RCPT delivery does use more bandwidth than multiple RCPT delivery, but the difference is often exaggerated. Most messages have, at most, a couple recipients, and they're usually on separate hosts, so multi-RCPT delivery buys them nothing.
Even on a list server, where multi-RCPT delivery could help, the potential gains are small because SMTP uses only a fraction of the bandwidth over most links--HTTP usually gets the lion's share."
In many developing countries people still pay by the byte.
Some interesting reading here:
http://www.oecd.org/dataoecd/5/47/34935342.pdf |
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Dave Sill
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| Posted: Tue Jun 21, 2005 11:13 pm Post subject: |
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DJB didn't write LWQ, I did.
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"Single RCPT delivery does use more bandwidth than multiple RCPT delivery, but the difference is often exaggerated. Most messages have, at most, a couple recipients, and they're usually on separate hosts, so multi-RCPT delivery buys them nothing. Even on a list server, where multi-RCPT delivery could help, the potential gains are small because SMTP uses only a fraction of the bandwidth over most links--HTTP usually gets the lion's share."
In many developing countries people still pay by the byte.
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How does the fact that some people pay by the byte make the paragraph quoted from LWQ wrong?
-Dave |
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Rick
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| Posted: Tue Jun 21, 2005 11:17 pm Post subject: |
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The report discusses spam, ie incoming mail. Some spammers already use multi-rcpt, but the receiving server has no control over what delivery method the client chooses. DJB is talking about the bandwidth used on outgoing mail, where the server can choose the delivery method and where multi-rcpt is promoted. Whether multi-rcpt would be an advantage or not is dependant on the type of traffic. For a generalized mail server the advantage is not stupendous, about 3% the last time I checked our servers.
http://marc.theaimsgroup.com/?l=qmail&m=104337391928112&w=2
If Payal has traffic that would benefit from multi-rcpt, he could try tricks with serialmail or a mini-qmail-like installation, or just install a mail relayer instead of qmail. |
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Payal
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| Posted: Tue Jun 21, 2005 11:18 pm Post subject: |
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If Payal has traffic that would benefit from multi-rcpt, he could try
tricks with serialmail or a mini-qmail-like installation, or just
install a mail relayer instead of qmail.
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It is "she" .. grr
What tricks? I shifted from serialmail because I thought smtproutes do
multiple deliveries. I desperately need to do multiple deliveries at a time. I have to push a backlog of mails using ALRM before I leave the
office daily.
With warm regards,
-Payal |
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Rick
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| Posted: Tue Jun 21, 2005 11:20 pm Post subject: |
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| Quote: | | It is "she" .. grr |
My apologies.
| Quote: | | What tricks? I shifted from serialmail because I thought smtproutes do |
Sorry, I was thinking of the other issue that sometimes pops up,
reusing a connection. Serialmail won't help in your case without
a lot of messing around.
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multiple deliveries. I desperately need to do multiple deliveries at a
time. I have to push a backlog of mails using ALRM before I leave the
office daily.
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qmail doesn't support this feature in SMTP. You could hack something
together but it may be easier to install an MTA that has the feature
set you require.
Rick |
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