Hi,

I require bulk mailing system for sending 5000 mail per day at every evening. Right i tried with mailing on CentOS5 but after sending 2000 mail all other 3000 mail get rejected... and i am not able to send mail any more in the single day...

Is there any solution for sending Bulk mailing in CentOS 5...

This depends on how you are sending the mail.
If you are getting mail rejected now, you will always get them, unless your method of sending is changed...

Oh.. So Can we use Sendmail for bulk mailing without issue?? No need to go for extra settings?

I'd like to know exactly why you need to be sending "5000 mail per day at every evening".

You wouldn't perhaps be asking here (LQ) about how to send SPAM, would you?

If you have a legitimate need to do this, you might need to contact your ISP, who is probably already viewing your email traffic with suspicion.

Assuming it is legitimate traffic and there are a lot of mailing lists and opt-in lists that do hit that traffic level, my suggestion would be throttle your sending speed especially if you're relaying through your providers mail servers. You're likely triggering some form of automatic spam prevention.

I would also suggest if you're sending that many messages through another host that you contact them and find out if there is a preferred method they would like you to use.

If you're sending direct from your machine and not through a smarthost or something similar then you may have a different issue like being blacklisted or something similar that you need to look into.

It's also possible that you're running into some kind of limit on your server although I think that is fairly unlikely using any of the popular mta's (you said sendmail, but also postfix, qmail, and exim4 should have no real issues.)

Thanks so much for all replies... actually it's company's demand to send bulk mail for 5000 / 10000 clients every evening... I think i should contact for ISP to send bulk mailing instead to create own smtp server.