On Mon, 31 Jan 2005 18:04:04 -0800 (Pacific Standard Time) Mark Crispin <[EMAIL 
PROTECTED]> wrote:

MC> c-client's POP3 client code is behaving correctly.

 Sorry for being unclear: I have absolutely no doubt about this. However
the correct behaviour is not very useful in this case.

MC> A POP3 server that does not advertise USER in CAPA is specifically stating 
MC> that USER is forbidden; it is the exact equivalent of an IMAP server that 
MC> advertises LOGINDISABLED.  A POP3 client MUST NOT send a USER command to a 
MC> POP3 server that supports CAPA but does not advertise USER.

 In theory I totally agree but in practice there is this broken server
which doesn't support any other way to login except by using USER but still
doesn't advertise it. It's clearly is a bug in server implementation and
using USER is the only way to work around it. The alternative is to not be
able to login at all which may be correct (although in fact I don't see
anything specifically forbidding use of USER in RFC 2449, it only states
that its presence in CAPA response means that USER/PASS are supported but
doesn't say anything about its absence!) but is absolutely useless.


 Speaking practically, what problems can I have if I still use USER even if
the server doesn't advertise it? AFAICS in the worst case the server will
reply that command is not supported. This doesn't seem very bad to me.

 Thanks,
VZ

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