Why would you want to?  First look at the RFC822 statement below.

Also look at though, RFC 1123, stating:
" The HELO receiver MAY verify that the HELO parameter really corresponds to the IP address of the sender. However, the receiver MUST NOT refuse to accept a message, even if the sender's HELO command fails verification."

I get a mix of valid and invalid HELOs, as well as many mail clients, such as outlook/thunderbird/etc just sending the Windows computer name.

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

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.


Bulent Guclu <[EMAIL PROTECTED]> wrote:
I use vpopmail5.4
I want my qmail-server to check whether helo address of sender smtp servers who send mails to my mail server is fully-qualified domain name or not.
How can I do that as tcp.smtp file or qmail-smtpd file other method?

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