One change which I would make would be the following which implements a variable sleep such that the sending of mail is more evenly timed to match 15 second intervals - I have used something similar for a dispatch of mail to our (many thousand) local users in order to stagger the load on the mail server. 

eval "use Time::HiRes qw( time sleep )";

foreach (@{ $userinfo }) {

    my $time = time();

    ...

    sleep 15 - ((time() - $time) % 15);
}

[download]

However, if you are employing sendmail as a local MTA, you may be interested in taking a look at vthrottle which is a rate throttling mechanism for Sendmail implemented via the milter interface (which can also be interfaced in Perl by way of Sendmail::Milter or PMilter). This may constitute a longer term solution for your mail throttling.

 

perl -le "print unpack'N', pack'B32', '00000000000000000000001011000000'"

In reply to Re: Controlling e-mails sent per hour by rob_au
in thread Controlling e-mails sent per hour by insite2000

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