How can i be sure, the users are receiving my emails?

[genevicu]

I am new in php list.

- I have a 6400 contact list.

i just send a new message to all of them, when i see the message history it says it was delivered to 6400 people, but just 296 people had seen it. I think it maybe something wrong.

i have configure this:
define("MAILQUEUE_BATCH_SIZE",50);
define("MAILQUEUE_BATCH_PERIOD",5);
define('MAILQUEUE_THROTTLE',0);

And i just read this viewtopic.php?f=6&t=37157

What do you think about configuring like DaWiddoPig says?

I am also receiving phpList Maillist Processing info mails, but they never get to 50 users to process so i think php is not sending them all.

I need some help with this, is really important.

THANKS!