Q:

how to specify maximum # of outgoing emails from SMTP by domain

i have sendmail, and i am sending mailshot every week. 
how can i tell my sendmail to limit the number of outgoing emails to a specific domain per hour (to avoid getting blocked by mail servers)
for example:
to send 500 email/hour at most to @yahoo.com
and the same for @gmail.com and so on
Thanks for your help

A:

The best way to solve the problem is to use something like milter-limit which is desgined specifically to throttle messages and can do this on a per-domain limit

