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Re: EXPN return codes still broken



On 04-Nov-99 at 21:13, Matti Aarnio (mea@nic.funet.fi) wrote:
>   You don't recall recent talk that 'make install' does not
>   overwrite router .cf script files ?
> 
>   Manually:  cp -p proto/cf/*.cf $MAILSHARE/cf/

Oops.
Now the results are consistent but still incorrect:

250 chronos.sovam.com Hello ariel
expn crosser@chronos.sovam.com
250 Eugene Crosser <crosser>
expn xxxx@chronos.sovam.com
550 no such user: <xxxx>
expn test-list@chronos.sovam.com
550 no such user: <"|exec /usr/local/list/.bin/flist test-list">
^^^^^^^^^^^
expn test-list-dist@chronos.sovam.com
550 no such user: <":include:/usr/local/list/test-list/dist">
^^^^^^^^^^^
vrfy crosser@chronos.sovam.com
250 Eugene Crosser <crosser>
vrfy xxxx@chronos.sovam.com
550 no such user: <xxxx>
vrfy test-list@chronos.sovam.com
550 no such user: <test-list>
^^^^^^^^^^^
vrfy test-list-dist@chronos.sovam.com
550 no such user: <test-list-dist>
^^^^^^^^^^^

I am using VRFY when creating a new customer ID to check if the new name
matches some exisiting alias ot mailing list.  In that case, the user
should not be created.  With the current behavior, there is no way to
check if a specific mailing address exists.  (Other question is that
VRFY may be used to obtain list of valid users on a system; it would
be good if access to the command could be restricted by IP address or
whatever...)

RFC821 is not very restrictive about when 550 should be returned
(and 550 is explicitly valid for VRFY on a mailing list) but EXPN is
implicitly assumed to return positive result on a mailing list:

     "For the EXPN command, the string identifies a mailing
      list, and the multiline response may include the full name of the
      users and must give the mailboxes on the mailing list."

"list of mailboxes" needs to be omitted these days for obvious reason
but common sense tells (at least to me:) that respnse to EXPN should be
positive if the address expands to anything presumably deliverable -
pipe, mailing list, etc.

Eugene