Jérôme Blion writes:
Hello,I'm trying to help a customer. He owns a virtual card website. He sends several thousands mails per day. I already setup MAXDELS and MAXHOST, I modified the queue length too to be able to survive to any new year mail flood. I fixed Debian Lenny's libraries (dbm package bug) An ISP told my customer he should send all mails through one SMTP connection. I didn't find any parameter to do it. Are there some documents I should read?
That ISP was probably explaining that all your customer's mail should be smarthosted through the ISP's mail server. In which case, theoretically, a single connection is all that's needed. But if all you're doing, for outbound mail, is using your ISP's smarthost, you don't really need a full- blown mail server, really. You should be using something else.
But, aside from that, Courier creates separate connections for different domains, without considering esmtproutes. If the mail queue does contain multiple messages for the same domain, and they're scheduled to be delivered, Courier will reuse an existing connection to the recipient's domain, if it's available.
But in any case, only a few thousand messages per day is no more than statistical background noise, and there shouldn't be any need to fine tune anything, even for peak volume that's in tens of thousand of messages per day.
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