Some agencies have an explicit policy of only allowing one agent at the agency to be queried for a project (One Off and Bust Off.) That is clear enough. Others, though, do NOT make it explicit that OOBO is their policy and have separate e-mail addresses for each agent. Presumably they do not read each others' mail.
it seems courteous not to query more than one agent at the agency at a time. But is it OK to query an agent, then have fun getting rejected elsewhere for a couple of months, then query another agent at the first agency? Or should we assume the policy is OOBO even if it is not explicitly stated.
Obviously one e-mail address for everyone implies OOBO even if the policy guidelines do not state it.
Well, not obviously, cause we have Query@New Leaf for our incoming queries but you can query as many agents as you want to, just one at a time.
Unless an agency says one and done assume you can query more than one agent. BUT only one at a time.
And you're right to give it some time between queries. While we say 30 days here I know I've been much farther behind than that at times, but you have no way of knowing that. Giving me some extra time is a good idea.
In the end the most important thing to remember is this: there's no such thing as the query police. Querying multiple agents here doesn't get you blacklisted; it might get you ignored. You can recover from that since we don't keep a list of inept queriers. (it would be in the thousands by the end of the summer.)