How to handle potentially large email lists?

Question

We have a micro site that is being distributed via email. This microsite has a form on it that allows you to specify x amount of email addresses to forward the microsite.

• What are our spam concerns?
• Can we use an api to handle the email sending? If so, who provides such a service?
• Could we alleviate spam concerns by limiting the amount of addresses you can forward to?

Answer 1

We ended up using an internal solution, however the solution i eventually found was sendgrid.com, for anyone referencing this question in the future.