Re: [EXIM] Error 503 Sender already specified

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Author: Ben Parker
Date:  
To: Philip Hazel
CC: Dr Andrew C Aitchison, exim-users
Old-Topics: Re: [EXIM] Error 503 Sender already specified
Subject: Re: [EXIM] Error 503 Sender already specified
Is there a way to stop exim "re-using" the connection, on a per-domain
basis? I also get 503 Sender already specified errors from another
system...

Thanks,

Ben

On Mon, 1 Mar 1999, Philip Hazel wrote:

> On Mon, 1 Mar 1999, Dr Andrew C Aitchison wrote:
>
> > > The MAIL command (or the obsolete SEND, SOML, or SAML commands) begins a
> > > mail transaction. Once started, a mail transaction consists of a
> > > transaction beginning command, one or more RCPT commands, and a DATA
> > > command, in that order. A mail transaction may be aborted by the RSET (or
> > > a new EHLO) command. There may be zero or more transactions in a session.
> > > MAIL (or SEND, SOML, or SAML) MUST NOT be sent if a mail transaction is
> > > already open, i.e., it should be sent only if no mail transaction had been
> > > started in the session, or it the previous one successfully concluded with
> > > a successful DATA command, or if the previous one was aborted with a RSET.
> >
> > The last sentence suggests that it would be reasonable to send MAIL again
> > after a successful DATA command. The more I read that sentence the more I
> > wonder if there are implied brackets, and where you put them changes the
> > meaning.
> >
> > In particular the clause "or it [if?] the previous one successfully
> > concluded with a successful DATA command" confuses me. Is this the
> > previous transaction or previous session ?
>
> Transaction, surely. (For a start, a session cannot successfully
> conclude with a DATA command. It can only conclude with a QUIT command.
> For a second, there's no concept of "the previous session" - the RFC is
> concerned with a single session.)
>
> > Is this a case when MAIL msut
> > not be sent, or one of the cases where it should ?
>
> It's a case where MAIL is permitted. This paragraph is trying to spell
> out what was implied before.
>
> Sigh. You should be on the DRUMS working group, if you want to pick nits
> like this, but I suspect it is a bit late now. I think the next draft is
> just about ready - [goes to look for it, but Netscape hangs up. Mutter.]
>
> However, I can post your comment, just in case there's time to change
> "one" to "transaction", which would be even more explicit.
>
>
>
> -- 
> Philip Hazel            University of Cambridge Computing Service,
> ph10@???      Cambridge, England. Phone: +44 1223 334714.

>
>
> --
> *** Exim information can be found at http://www.exim.org/ ***
>
>



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