We're beginning to manage a Newsletter, and we have many (hundreds) of email addresses to deal with and send out to.

Does anyone run a similar operation? If so, what software do you use for your mailings?

I searched for "baulk mailer" and several other suck keyterms on Google, and, not surprisingly, got offered millions of email addresses for only 1c each etc.

We need something legitimate that won't steal addresses, but merely manage the ones we already legitimately have and send out a newsletter.

Any ideas / suggestions anyone?