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No, not exactly
an SMTP-connection is always between two hosts. As the
names say the sending host (client) send the message to the SMTP-Server.
If the sending host is a workstation (for example running
MS Outlook) then this client will send the windows machine name as HELO
string.
If the message was send from a client who is sending his
message to another SMTP-Server this SMTP-Server will forward the message to your
server (if it's for a domain on your server)
This connection from the other SMTP-Server to your server
is tecnicaly the same as the connection from a simple workstation to your
server. As a little difference the other SMTP-Server will use a full qualified
domain name (FQDN) as HELO-string while the simple EMail client will use the
machine name.
Don't worry too much about this "incomplete" HELO strings.
There are more important flaws in clients like MS Outlook (missing message-id,
commandspace)
Markus
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Title: Message
