Because email is terrible, I've been having a long talk at work about deliverability.

You see, we send app-notices through email. Enough that we should be using more than one IP address. But we keep landing on some blacklists.

I had to get firm yesterday and point out that we've exhausted the technical solutions, and the only way out of the hole is to improve our behavior and wait for us to be released from purgatory.

No one likes to wait. Especially with customers complaining.