>Hi all !
>I have the task of setting up a mailserver capabel of sending 400 000 mail
>in a max time of 12 hours.
>All mails have an attachment of 1 mb

400K x 1MB = 400 GB x 4/3 for MIME encoding = 530 GB

/ 43200 secs/12hours = 12.5 MB/sec

So you'd need an Internet connection of 25 MB/sec = 200 Mbits/sec

but see below about sending one msg to multiple recipients in one SMTP
session.

>The system should be a mailer for a newsletter system. As I made quite a
>couple of things with postfix, my concern is the amount

your concern is well targeted :))

Try very hard to convince the newsletter owner to send the same message
body (body + attachment) 400K times, and not 400K customized messages one
time. This is important for sending to postfix, chunking recipients into
100 per SMTP session to send one DATA command and.

And if you can send 40 usersaol.de a single 1MB msg, rather than 40 users
x 1MB msg.

Use a caching disk controller of 64+ MB cache. separate disks for logging
and mailqueue.

Use 3 or 4 machines.

1 GB RAM

See the postfix faq for tuning for large numbers of files.

Put BIND 8 on each machine

Sort the address list by recipient.domain, then group you RCTP TO/SMTP
session by recipient.domain and send to postfix in that order.

Len

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