Re: [exim] batching messages to ISP

is this possible ( ie will exim do this)
1. let my PHP app generate the messages with a timestamp but with exim not
delivering
2. eyeball the messages and see what time span will cover 50
3. Run exim with -q <startID > <endID> option

repeat as necessry

OR

is there a way of detecting whether a 550 error message will be generated
before actually sending the message. ?