The short answer is: as much as you want, and, as much as your CPU/RAM can handle.
Although that short answer might seem awesome, you have to keep in mind the multiple SPAM laws that exist online. For example, buying a list of leads and sending mail to them may result in SPAM complaints.
These complaints will reach us.
Once they do, your server will be scrutinized for its legitimacy. While we are friendly and support many customers who have very active mailing lists, we do not tolerate blatant SPAMactivity.
- SPAM dirties our IP range's reputations;
- SPAM dirties our company's reputation;
- SPAM is extremely counter productive.
The above said, you can e-mail all you like, but be wary of the results you may encounter.
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