Hello.

Well, i do not know, .. but i have

  message_size_limit = 500000

which postfix transforms to RFC 1870

  250-SIZE 500000

(Btw, does the client part of RFC 1870 actually exist in practice?
I cannot recall to have seen it.  Does postfix log such client
declarations?  Would not think it does..)

I have a problem in that i would like several senders to be able
to send larger messages.  (Currently they are bounced, *but* since
the "real receiver" is for example a gmail address, that bounce
event is then *not* forwarded, so i do not even get a notion that
something happened (except by parsing log files, but whee..) until
i go to the mailbox via IMAP or POP.)

The RFC has a section

  7.  Minimal usage
  ...
   The numeric parameter to the EHLO SIZE keyword is optional.  If the
   parameter is omitted entirely it indicates that the server does not
   advertise a fixed maximum message size.  A server that returns the
   SIZE keyword with no parameter in response to the EHLO command may
   not issue a positive (250) response to an extended MAIL command
   containing a SIZE specification without first checking to see if
   sufficient resources are available to transfer a message of the
   declared size, and to retain it in stable storage until it can be
   relayed or delivered to its recipients.  If possible, the server
   should actually reserve sufficient storage space to transfer the
   message.

Letting aside the "extended MAIL" client command that i never have
seen, what i would hope for would be that postfix simply says

  250-SIZE

and would then have something like a lookup table that allows to
configure the actually used size limit based upon senders.
Is this somehow doable?

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)
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