Can IMail be configured to send emails in batches of say 50 through a relay host, or does anyone know of something that will?
what's a "batch", in SMTP terms ?
one SMTP session with 50 RCPT TO:'s ?
Imail "batches" or "clumps" to relayhosts in 5 per SMTP session, or at least did at one time. But this is 5 SMTP sessions in rapid succession, and then a pause, then 5 more. When Imail changed to this behavior, we saw a large increase in the rate of list delivery from Imail to IMGate as relayhost (after Imail queue processing got it knickers untwisted enough to even attempt to send out to IMgate :)) ).
or
50 SMTP sessions each with one RCPT TO (in rapid/batch succession, ie, rate limiting) ?
ie, when/how does "50" kick in? and what does "blocking" from 51 on look like? the relayhost does a 4xx reject? 5xx reject?
I have a customer that has no choice of providers except a cable provider who recently started blocking port 25 to all SMTP servers except their own and restricts emails to 50 in one shot. His thought was to simply upgrade to their business class service, but the only advantage of this was that they removed the port 25 block. They would still restrict him to 50 emails.
50 emails to one MX? 50 emails per min/hour/day to whatever?
For the extra $70 the cable company wants for the business class service, they shouldn't restrict anything, but in their infinite wisdom they deem it necessary to choke the hell out of business owners also.
agreed, the principle of blocking access from subscriber access networks to port 25 is a good one (because the abuse from subscriber access networks world-wide continues to be enormous), plus some kind of <hurdle> to unblock it. A one-time $70 is a good hurdle, but $70/month is too much. infected/comprised machines never get over any hurdle.
Len
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