Mass Emailing Question

A few Mass Emailing Questions.

[crookyboy]

Hi there,

I am writing a mass mailing system for a company. They have arround 30,000 customer's and need to send email to each and everyone of them.

I have written mass mailing programs in the past (using php) and know that its best to:

1. Open one socket connection to sendmail
2. Use BCC as much as possible to lower the overheads
3. Send them in batches

The script I wrote in the past for my own website subscribers, however, seemed to die at around 3,000. so getting 30,000 might be a problem.

I was wondering if anyone had any experience of writing mass mailers of around 30,000 and if they could give me any advice regards ISP blacklisting and/or any tips on how to go about writing them (special methods etc.).

Thanks :)

James

[submitx]

Why not buy off-the-shelf software? You can get pretty decent ones for hundred bucks.

[crookyboy]

They currently use 'off the shelf software' and it's no good. It needs to be more custom built and operate via a web interface.

Does anyone know of any PHP mass mailers out there that work well using sockets?