[Mailman-Users] nodupes flag

[Young, Darren]

What / how exactly does the 'nodupes' flag do? That page says it 'tries'
to filter out duplicate messages to users, how does it determine that 2
addresses are in fact the same person? And on that, if I have 1 member
on a list with 2 addresses (same person), say jane.doe at mydomain.com and
jane.doe at yourdomain.com and the nodupes flag is on for one or both of
them, will Mailman in fact not duplicate the message to those 2 member
address?

Reason is, we're in the middle of converting from one domain name to a
new one and would like to leave the old address as well as the new
address in every list for a period of time. Then, after this time
passes, remove the old member address. However, I don't want people to
start receiving duplicate messages and was wondering how exactly this
flag works.

I'm currently planning to migrate people to the new domain via a
clone_member command for every member of every list. Have a script dumps
out the current membership for a list and if the domain portion is the
old one it does a clone from user at old_domain to user at new_domain. I added
the -r flag to the clone_member command to remove the old address but
have been asked to see if we can maintain the multiple memberships
without people receiving dupes.

Any feedback would be great. Thanks.

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| Darren Young              | http://www.chicagogsb.edu     |
| Senior UNIX Administrator | darren.young at chicagogsb.edu   |
| University of Chicago GSB | darren.young at gsb.uchicago.edu |
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