[Mailman-Users] mailman sent mails more than one time

[Axel Loewe]

hi out there,

i encountered a problem with mailman after a long time of successful 
use. i created a new list with about 113000 users from a textfile and 
sent a mail to the list.
after some time, i noticed that mailman delivers the mail to the mta 
(postfix) more than one time for some users. additionally, it made 
pauses of some minutes each time when it sent out an amount of mails.
mailman is configured in a way, that i have to approve every mail before 
it is delivered to the mta and i'm sure that i approved this mail only 
one time.
an other point is that list_members shows these addresses only one time, 
too. i don't no what i did wrong, espacially because mailman worked 
great for me for a long time.

do you have any ideas or suggestions?

yours axel