From: Mariano Cunietti (mcuniettienter.it)
Date: Mon Oct 03 2005 - 05:07:32 CDT

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Hi,
after setting up my "reject_non_fqdn_hostname", I looked around to see
what RFCs mandate about HELO syntax, and I did find this:

RFC 821:

HELLO (HELO)

            This command is used to identify the sender-SMTP to the
            receiver-SMTP. The argument field contains the host name of
            the sender-SMTP.

            The receiver-SMTP identifies itself to the sender-SMTP in
            the connection greeting reply, and in the response to this
            command.

            This command and an OK reply to it confirm that both the
            sender-SMTP and the receiver-SMTP are in the initial state,
            that is, there is no transaction in progress and all state
            tables and buffers are cleared.

RFC 2821:

4.1.1.1 Extended HELLO (EHLO) or HELLO (HELO)
   These commands are used to identify the SMTP client to the SMTP
   server. The argument field contains the fully-qualified domain name
   of the SMTP client if one is available. In situations in which the
   SMTP client system does not have a meaningful domain name (e.g., when
   its address is dynamically allocated and no reverse mapping record is
   available), the client SHOULD send an address literal (see section
   4.1.3), optionally followed by information that will help to identify
   the client system. The SMTP server identifies itself to the SMTP
   client in the connection greeting reply and in the response to this
   command.

There's no point that states an SMTP client should mandatorily give an FQDN.
Can anybody address me to any resource I can eventually look at?
TIA

Mariano

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Mariano Cunietti
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