Exim treats remote 552 (quota) errors as permanent, they should be
treated as temporary errors instead, shouldn't they?
This gives some problems with mailman, as it seems unable to parse
the DSN and find that the error was indeed temporary. It would be
nice to have exim treat them as temporary and be able to specify
retry rules for them as one can do for specific 4X errors.
Unfortunately the list archive cannot be searched for 552...
