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Conference lassie::ucx

Title:DEC TCP/IP Services for OpenVMS
Notice:Note 2-SSB Kits, 3-FT Kits, 4-Patch Info, 7-QAR System
Moderator:ucxaxp.ucx.lkg.dec.com::TIBBERT
Created:Thu Nov 17 1994
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:5568
Total number of notes:21492

5283.0. "Limiting the size of smtp mails" by BARNA::DSMAIL () Thu Feb 27 1997 10:27

    Hi to all!!!!
    I've a customer with ucx 4.0 eco 2 and vms 6.2. He's using smtp and
    he'd like to know if he can limit the size of the mails to be
    transferred or received. He's in a university and the pupils use the
    mail for sending sw which produces the net to collapse.
    I've looked in the documentation and I haven't found anything.
    Does anyone know how to do it or if this is possible.
    Thanks for your help
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5283.1punish them :-)UTRTSC::KNOPPERSOswald KnoppersThu Feb 27 1997 10:303
Apart from 'mc authorize modify <accountname>/flag=disuser', no.

Oswald
5283.2No way?ALCALA::AMALIAFri Feb 28 1997 05:105
    Oswald, I don't understand you.
    Do you mean the only solution is to disable the users from sending any
    kind of mail?
    Is There no way to leave them send only small mails ?
    Thanks for your help
5283.3Educate the usersUTRTSC::KNOPPERSOswald KnoppersFri Feb 28 1997 05:306
>    Is There no way to leave them send only small mails ?

Not as far as I know. You could limit diskquota, but you wouldn't be
limiting mail only.

Oswald
5283.4CFSCTC::SMITHTom Smith MRO1-3/D12 dtn 297-4751Fri Feb 28 1997 09:5615
    Limiting the size of incoming messages requires the ESMTP protocol (and
    of course software that does something with it). UCX uses SMTP.
    
    If the customer feels this is really important, he/she could set up a
    UNIX relay to handle incoming and outgoing mail and run sendmail V8 on
    it. sendmail (any version) can also limit the size of outbound
    messages.
    
    What makes them so sure that mail is any way related to whatever
    network problems they have? In any case, it wouldn't help their
    internal network much unless the incoming size screening was done at
    their gateway to the outside world, and outbound messages would still
    have to travel to the relay doing the outbound screening.
    
    -Tom
5283.5The reason limiting is imposed is because limiting is imposedtwick.nio.dec.com::PETTENGILLmulpWed Mar 05 1997 01:0116
Since there are mail relays that limit the size of mail messages, and impose
the limit by bouncing the mail, the way to avoid have mail bounced back to
you is to limit the size of the mail messages you send.

Clearly the limits on mail size are just annoyances because there are standard
utilities to chop up a longer mail message and just send the peices.  Chopping
them up increases the total size sent.

Of course, the files that need to be chopped up because they are two long
are often binary files that have to be uuencoded or mimed to get them past
the restriction on 7 bit US-ASCII.

If you consider how US centric the Internet protocols are, its easier to
understand why the French get so upset at English language of all sort.
US-ASCII has been superceded by about 5 new standards over the past 20 years,
all of which assume that a character is based on one or more octets.