Re: [FW-1] smtp security server problems with FP3

[Volker Tanger <volker.tanger@FW1-NOSPAMDISCON.DE>]

Greetings!

Alberto wrote:
> ah, so they've known that RFC when developing FP3?
> and, what about email clients? none of them accomplish RfC 821?

It seems that many clients (checked mutt, Mozilla, Outlook) just pass
the address(es) on unchecked - expecting the next MTAs (sendmail,
postfix, MS-Exchange) to complain accordingly.

As I have not seen a single email adresse exceed 100 (or RfC-wise: 1000)
characters, the limit is set reasonably high IMHO. For more recipients
than can be held within that limit, the clients should send the mail in
according small batches as proper MTAs automatically do.


Rationale:

In real-life noone wonders why he cannot squeeze complete postbags full
of letters through the small slit of the public letterbox. It is clear
to everyone that the two possibilities are to either insert the letters
sequentially in small heaps (5-10 letters a run) or to deliver the bags
directly to postoffice's service centre that sorts them into properly
limited heaps itself.

Similarily SMTP/email: either obey the limits (i.e. only a limited
number of recipients per round) or let an MTA/MDA (massmailer, mailing
list) divide that big bundle up into congestable sizes - or suffer
crumpled letters and a number of nondeliveries.

Bye

Volker Tanger
IT-Security Consulting

--

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Wrangelstraße 100
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Telefon  (030) 6104-3307
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volker.tanger@discon.de
http://www.discon.de/

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