Best option for sending a newsletter

[Paco Gracia]

Hello everyone,       I have to send a daily newsletter to 60.000 e-mail addresses that are stored in a MySQL database. The newsletter is the same for everybody and the process of composing and sending it will be started from a PHP web app.       I have several doubts:       1- Should I use mail() function from PHP, invoke qmail directly or create a mailing list with ezmlm?     2- If I don't log the sending of the newsletter will it increase the speed or just free CPU?     3- What side effects have to set concurrencyremote to high values like 300?     4- Is it necessary to use a higher value in tcpserver's -c option if I use mail() function?     5- Could I set up a second qmail instalation for just sending the newsletter so it doesn't slow the "normal users" mail?   Thanks in advance, Paco