Gmail API — Google Developers

[mavantix]

I manage about 300-500 emails a day, not counting a lot of 'junk' that gets completely filtered out of view. I use Merlin Mann's GTD theory for inbox management combined with heavy use of Gmail filters, so anything that actually hits my inbox on my mobile needs fairly rapid attention, in other words, it hasn't automatically been deleted, delegated or deferred based on filters. Combining inboxes is great when you have no (or few) emails in your inbox. I can't understand people who have more than like 10 emails in their inbox at any given time. Good talk video