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>>For up to 1,000 subscribers, mailchimp will charge $15/mo to send unlimited emails. Everything is configurable over a restful API. Other, similar services, exist.
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>>What you gain is no hassle about your domain being blocked by receiving servers because of mail volume. And not having to deal with maintaining the mail server.
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>>Hank
>
>What do you mean by "subscribers"? In my case the client has a customer base of just under 10,000 customers, some with multiple email addresses. On average they seem to send out about 1,000 emails a day to a subset of their customer base, but some days there could be more than that. These emails contain specific information for each customer. Once every so often they will send a standard email to all their customers, This might happen 6 times a year.
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>So if I set up my own smtp server there is the possibility that receiving servers may eventually block my emails because it appears like spam?

Yes; there are hoops you can jump through to get white-listed, but from everything I've read, it's a far-from-easy process. Also, preventing attacks on email servers requires a lot of effort. I ran my own server for 5 years or so, late 90's to early oughts, and things were easy then: it was still a pain to have to deal with it all. I'd suggest reading up on it before making a decision. Basically, it's a job specialty all of its own.

Hank