[SAGE] politely sending emails to huge lists of recipients

[Marco Marongiu <brontolinux@xxxxxxxxx>]

Dear fellow Sysadmins

I need your advice about a tool that can safely send messages to huge
lists of recipients, avoiding spam-like patterns (e.g.: fractionating
the recipient list in acceptable chunks, sending the message to each
chunk leaving a reasonable interval between two deliveries), or if you
have a tested configuration for postfix that does the job.

At $WORK we had some problems with email providers, due to the fact
that $EMPLOYEES sent out emails to huge recipient lists (suffice it to
say that one of the smallest was ~370 recipients long). I discovered
that while investigating about $PROVIDER rejecting our messages.

I thought that for (almost) fixed recipients list, a common mailing
list manager (e.g.: mailman) would suffice. But sometimes they have to
send a one-shot message to a long list of recipients. Using mailman
for that would require them to change the subscribers list over and
over, and I am not sure that it is safe to let them do it.

Suggestions?

Ciao!
--bronto