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crazywolf2010Flag for United Kingdom of Great Britain and Northern Ireland

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EMail Sending rate for open source EMail Server

Hi,
I am setting up an outgoing email gateway.

I need to send millions of emails every single month to our company customers. I can schedule these emails to be sent in waves , I mean I can throttle their rate every minute/hour over number of days/weeks. I know a spike in sending email could be treated as a Spambot.
 
I looked at Amazon SES /Mandrill and that comes out to be very expensive. My emails will be mainly marketing emails and won't have attachments. Majority of these emails are sent to existing customers so this not a SPAM and shouldn't be treated like that by ISPs.

I am inclined to set up servers by myself using a cheap hosting options.

Can someone roughly calculate how many emails one could send over week/month if I have 10MBPS connectivity to outside world?
Let's say every email is around 50KB in size.

Thanks
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Dave Baldwin
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Hi DaveBaldwin,
Many thanks for the details. Currently we use a 3rd party gateway. I have done some configuration for them and they can send 1 Million emails in less than 24 hours. They use 8 dedicated IPs over 2 dedicated windows MTA servers to forward these emails.
I don't have access to their entire system so I am not sure what technology they use.

It's possible with very minimal hardware but  your suggestion related to ISP may be right. I will check that out now.

Thanks
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