On Wed, 23 Feb 2005, Harald Schneider wrote:
> Hi Davide,
>
> it seems that XMail quits with a "Bad SMTP response" when the remote server
> sends a 220 response after a HELO.
> Here an example:
>
> Instead of
>
> Connected to mail.uniovi.es.
> Escape character is '^]'.
> 220 ALEPH.NET.UNIOVI.ES -- Server ESMTP (PMDF V6.2-X17#30969)
> helo test
> 250 ALEPH.NET.UNIOVI.ES OK, dsl-xxx.arcor-ip.net [213.23.50.219].
>
> ... this server sends
>
> Connected to mail.uniovi.es.
> Escape character is '^]'.
> helo test
> 220 ALEPH.NET.UNIOVI.ES -- Server ESMTP (PMDF V6.2-X17#30969)
> 250 ALEPH.NET.UNIOVI.ES OK, dsl-xxx.arcor-ip.net [213.23.50.219].
220 is simply not an allowed response, according to the RFC. Here is the
relevant section of allowed responses:
COMMAND-REPLY SEQUENCES
Each command is listed with its possible replies. The prefixes
used before the possible replies are "P" for preliminary (not
used in SMTP), "I" for intermediate, "S" for success, "F" for
failure, and "E" for error. The 421 reply (service not
available, closing transmission channel) may be given to any
command if the SMTP-receiver knows it must shut down. This
listing forms the basis for the State Diagrams in Section 4.4.
CONNECTION ESTABLISHMENT
S: 220
F: 421
HELO
S: 250
E: 500, 501, 504, 421
MAIL
S: 250
F: 552, 451, 452
E: 500, 501, 421
Also, the above sequence is completely broken, since the only way for SMTP
to return multi-lines, is to have the '-' character after that status
code.
- Davide
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