500 error in sending bulk mail

Hi All
i started a project one year before…form this notifications and mails used to be send…
when the mail list was small every thing was working good
now my email list increases …in thousands
so this 500 error occurs due to the response back time is more during sending mail

to sending mails i used Action mailer and privet SMTP server(which has unlimited capacity to send mail)
now i want to manage all these things and some control on sending mails …
like which is delivered ?
which is pending ?

and which is opened by user.?
basically a Email manager …
So Please suggest me if any one has idea…

I Google for it and find some applications like
http://postageapp.com/

which provide mass mailing … but they has own limitations…

Regards,
Shyam
+91-971-618-9650
shyam@crypsis.net

Hi All
i started a project one year before…form this notifications and mails used to be send…
when the mail list was small every thing was working good
now my email list increases …in thousands

so this 500 error occurs due to the response back time is more during sending mail

to sending mails i used Action mailer and private SMTP server(which has unlimited capacity to send mail)
now i want to manage all these things and some control on sending mails …
like which is delivered ?
which is pending ?

and which is opened by user.?
basically a Email manager …
So Please suggest me if any one has idea…

I Google for it and find some applications like
http://postageapp.com/

which provide mass mailing … but they has own limitations…

Regards,
Shyam
+91-971-618-9650
shyam@crypsis.net

Delivering a lot of email can be difficult, and the big providers
don't always make it easier. Yahoo is notorious for rate-limiting
incoming mail.

If you still want to deliver mail with your server, make sure the
following are set up:

- correct reverse DNS for the mail server

- SPF record for the mail server

- if at all possible, DKIM sign all outgoing mail and set up the DKIM
info in DNS

- get onto the various providers' (AOL, Yahoo and Hotmail) abuse
notification systems. Sometimes referred to as "feedback loops", these
will allow you to receive spam complaints and deal with them
correctly. Apparently, rate-limiting is less of a problem if you've
got these set up.

You may also want to look into a service like AuthSMTP, which can
handle some of the details for you.

--Matt Jones