Bearing in mind I haven't yet done any benchmarks, which do you think
is faster - SMTP with multiple RCPT commands or the PHP mail()
function (with it launching a separate sendmail process for each
mail() function call)?
No brainer, SMTP will almost certainly be faster. My mailing list system
(written in PHP obviously) can dump 600k customised emails to the local
SMTP server in a couple of hours. Doing the same with the mail command
took over 24 hours. How much slower will depend a lot on how you have
configured sendmail, but it's never going to be faster than a socket
connection to the local SMTP server.
Thanks.
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