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chas wrote Consider a discussion forum product where a dozen people have already participated in a particular thread. These people, when posting their messages, checked a box which said "email me when somebody else responds/adds to this thread". (Yes, this is nicked from Cold Fusion Forums :-)

Now, a 13th person adds his 2 cents to the thread and posts a response. We want to now send a mail to each of the first 12 participants.

No problem so far, except mailing all 12 people is going to take quite a bit of time, and contributor #13 is going to get impatient waiting whilst this is happening. Then imagine a discussion thread with dozens of participants/posts.

How about something like 'write the message and the recipients to a database table, then have something poll that table.' Or have a local mailer set up to receive messages for delivery immediately, and point Zope at that - actually formatting up the message for delivery shouldn't take that long (particularly if it's the same message - you format it once, send it 12 times.) Anthony -- Anthony Baxter <anthony@interlink.com.au> It's never too late to have a happy childhood.