>Gary V wrote:
>
> > I would think you could eliminate the need for
this by having Postfix
> > reject all oversize messages before they enter the
system. They page
>shows:
> >
> > A >= B > C >= D
> >
> > I don't agree that this is "the only
relationship that makes sense". I
> > think this would be more appropriate:
> >
> > A < B > C >= D
> >
> > This would hopefully eliminate rejecting messages
after they have been
> > sent to Maia.
>
>That depends on your oversize policy. If your policy
with regard to
>oversized items is to reject them, then yes, you'd be
wiser to just set
>your MTA's size limit to max_allowed_packet (A = B),
knowing that the
>MTA will not be relaying anything larger than you can
handle.
>
>On the other hand, some admins would prefer to accept
oversized items,
>even if it means they won't get scanned and will be
blindly passed on
>for delivery. The theory is that spam and malware tend
to be relatively
>small to maximize distribution bandwidth, so size
becomes something of a
>crude filter--particularly when size limits are set
quite high.
>This 'accept' scenario occurs when A > B.
>
>The recommended A >= B relationship, then, comes from
the 'accept' (A >
>B) and 'reject' (A = B) scenarios. It can be
misconfigured,
>naturally--setting A > B in combination with a
'reject' policy would
>result in oversized items generating a bounce DSN, which
may not be
>desirable, and of course setting A = B with an 'accept'
policy is
>pointless since no oversized mail will ever reach
amavisd-maia to get
>accepted.
>
>One alternative (in future versions) may be to remove
the 'reject'
>policy altogether as an option and use only a default
'accept' policy,
>such that all rejections must be done upstream at the
MTA, and anything
>that gets past the MTA must either be processed by
amavisd-maia (size <=
>C) or passed through without being scanned or stored
(size > C).
>
That option makes perfect sense to me. The one thing I was
concerned with
was accept, then bounce - which is likely to happen if the
default settings
are used. I admit I was not fully aware of how the oversized
policy fit into
this, but now I understand how ALL the pieces interrelate.
>- --
>Robert LeBlanc <rjl renaissoft.com>
Gary V
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