When you send out that email request you’re waiting to hear back about, you can automatically shuttle it into a “Waiting For” folder with the right outgoing rule. Microsoft Outlook expert Taco Oosterkamp recommends adding a unique and unnoticeable notation at the end of any email you’re waiting on (he uses
[w] ), and then use an Outlook rule to filter messages with
[w] in the body to your Waiting For folder. Hit the link for a step by step tutorial on setting it up in Outlook; seems like an easy thing to replicate in other clients that support saved searches (like Thunderbird or even Gmail).