The “yours?” email: why forwarding breaks at five people

Almost every team that signs up for Mailslot was sharing one mailbox before. Their inbox had a certain kind of email in it: a customer message forwarded to a coworker, with one word added. “Yours?”

Why it works with two people

With two people you can hold the whole inbox in your head. You know what the other person is working on because they sit across from you. Reading an email twice costs a minute.

What changes at five

At five people there are ten pairs who need to know what each other picked up. We looked at the first month of imported history for 60 teams of five or more. On average, 4% of messages got replies from two different people and 7% got no reply at all. Both come from the same cause: nobody could see who had it.

The fix is an owner, not a tool

You can fix this in Gmail with labels if everyone is disciplined. The rule is that a message has exactly one owner from the minute it arrives, and everyone can see who. Mailslot does that part for you, but the rule is what matters.

What to do this week

Count the “yours?” emails in your sent folder for the last 30 days. If it's more than ten, pick one person a day to assign everything that comes in. That alone removes most double replies.