Thanks for posting! Constant Contact is designed to send bulk emails and we have a great sending reputation with other ISP's so you don't have to worry about the bulk being blocked. There is no limit to the number of emails you send from your account but instead, we would suggest looking at how many emails you are sending to your contacts. For example, if you have 800 email addresses, sending to them all at once is not a problem but if you want to send them all three different emails, make sure you space them out. This is not because the mail would not be delivered but instead, there is a concern for how many contacts might opt out.
If you are still concerned about sending to the large list there are a couple of things you can do to help. First, make sure Authentication is on in your account. This is an extra step to ensure your email is recognized as coming from Constant Contact. Second, if you are sending to one domain or company, ask them to whitelist to make sure your email gets through their filters.
Hope this helps,
Hannah M. Community and Social Media Support
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