As I read the EXIM 4 book, [pages 274-278], for the Retry Rule Pattern
with an error field type of "quota", the address that is available for
checking is the recipient address.
I would find it useful if this was the sender address OR that the field
would accept a condition where I could specifiy the string variable I
wanted to check against. I would need to know which ones were set at that
point.
