A lot of ISP rate limit the amount of e-mails that is sent from a particular IP address. What is the proper way to get around that rate limit?
Our company has an iPhone application that sends many e-mails because of our large user base and many e-mails go to different ISPs that rate limit the number of messages coming from a specific IP.
We do not send spam and we are a legitimate business. However, is there a better way to resolve this limitation rather than just getting a ton of IP addresses?
Ideally, I wouldn't want to rely on a third party service to send mail. However, if its the only possible solution, we would consider.