It sounds like you weren’t sending very frequently, if you logged in anytime over those 5 months there was a banner letting you know it was getting shut down.

It sounds like you weren’t sending very frequently, if you logged in anytime over those 5 months there was a banner letting you know it was getting shut down. If it makes you feel better, deliverability people will tell you a list that’s been sitting with no sends for a year or more quickly becomes worthless due to list rot (abandoned emails, expired domains, job switchers, people who forgot you exist and will mark spam/unsub, etc). When you send to an old untouched list, it can tank your domain rep in Gmail since the algo sees tons of bounces/unsubscribes/negative signals. They basically assume you’re a spammer. So it probably would have been a PITA to warm that list again anyways. It’s shitty that gmail incentivizes bulk senders to be annoying and send a lot, but it is what it is.