Nested distribution lists

[Britt]

I'm currently using several nested distribution lists and I noticed a strange problem today. I work for a school system, and all schools and administrative departments have their own lists, and then master lists for all elementary, all middle, and all high school accounts. On top of all of this I have a top level distribution list that then sends to each of these lists.

So.... school1 and school2 are members of _middleschools, _middleschools is a member of _everyone. Sending to _everyone sends to school1 and school2. This works pretty well until I add all my groups in.

I've got 2269 users, and when I add the nested distribution lists piece by piece, everything sends to a certain point, and then some of the distribution lists get dropped, and I recieve Postfix error messages like so:

This is the Postfix program at host mta.rcps.info.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The Postfix program

<_rvjdc@rcps.info>: rcps.info

Is there an upper limit to number of recipients that can be sent in a single distribution list? Or perhaps a limit on nested levels? The groups that get dropped are mostly consistent, but not completely, and are not alphabetical by either the top-level distribution lists or by the lowest level distribution lists.

I'm using 4.5.2 GA 699 MACOSX FOSS installation on OSX Server 10.4.8.

Thanks

[jhaefele]

We've seen the same thing at our high school.

Distribution list: wholeschool@school.org

• classof2013@school.org
• classof2012@school.org
• classof2011@school.org
• classof2010@school.org
• facstaff@school.org

Each of the classes get the message, but nobody in facstaff@school.org does.

The total of the first four lists is ~1050 users, with an additional 175 in facstaff. We're receiving no error messages, and the students all seem to be getting the announcements bulletins we're sending out via this list (though it's impossible to say; it could simply be that no students have reported any problem).

Any help on this would be fantastic.