How do we know when our IP has been blocked?

[BenJackGill]

This is a great app!

But how do we know when our IP is blacklisted?

The guide says "after a large number of attempts, the email providers will usually blacklist your IP address"...

But how many checks is a "large number" exactly?

If it's impossible to know when an IP is blacklisted, can you give us some sort of guide to be aware of? 10 checks? 100 checks? 1,000 checks?

[mfrye]

Thanks :) It really depends on what email providers you're looking up. All of them are different.

If you have a list of emails, and the majority end up hitting gmail, you're going to get flagged sooner. It's been awhile since I tried running this in bulk, but I think it was a couple hundred over 30-60 mins then requests started failing.

The right solution here is to track failures and switch your ip/proxy after a certain rate of failure. So there's a bit of dev ops work involved.