What is the cause of the Bad Request error

Hey hey! Can you drop the URL for your table here? (if applicable) 🫶 Don't worry, only admins will be able to open your table 😉

Hey Ian M., is this from Prospeo?

If that's the case, looks like this is happening because the domains with these errors are either unreachable or don't have valid MX records. This actually seems to be expected behavior- Prospeo is returning an invalid domain name error, which in these cases as they are reachable from my checking, means they don't have valid MX records and it's happening at a rate that is expected. Here's some more info from Prospeo about this:: [https:://prospeo.io/api/email-finder#::~~::text=The%20domain%20name%20you%20submitted%20is%20not%20reachable%20or%20does%20not%20have%20valid%20MX%20records](https://prospeo.io/api/email-finder#::~~::text=The%20domain%20name%20you%20submitted%20is%20not%20reachable%20or%20does%20not%20have%20valid%20MX%20records-Let)

Let me know if you have additional questions!

Ah, it's likely prospeo's own server or filter that's failing the check then