There have been postings about the problem of subscribers to multiple
lists sometimes getting multiple copies of postings, and I don't think
that a reasonable solution has appeared.
In my case the problem relates mainly to administrative postings about
matters like machine downtime and the like which have to go to several
lists. Since most of our lists are in the same general subject area of
habitat ecology, this leads to multiple copies.
For administrative postings by someone with system privileges, it seems
that there is a fairly simple solution. I have a closed list that I use
only for test purposes, called (say) xxx. If I want to send mail to
multiple lists without duplication I simply combine them with sort -u
into xxx and send the mail to xxx. After it has been processed I erase
the file. Of course this doesn't work if there are slight differences
in the addresses for the same subscriber, but that is minor.
If anyone has an easier solution or notices any bugs or security holes
in this, please let me know.
Bill Silvert at the Bedford Institute of Oceanography
P. O. Box 1006, Dartmouth, Nova Scotia, CANADA B2Y 4A2
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