Added by Oscar Francia over 16 years ago. Updated over 16 years ago.
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Description
php: /system_advanced_notifications.php: Could not send the message to mail@mail.xyz -- Error: 504 5.5.2 <192.168.1.x>: Helo command rejected: need fully-qualified hostname
That's a problem with your mail server, it's rejecting the connection.
If we can easily send the FQDN of the system in the HELO that would be preferable.
Maybe this should be a toggle. Some (many?) mail servers will also reject a system's FQDN if its forward and reverse DNS entries do not match, so supplying an FQDN may hurt in other scenarios.
AFAIK (according to RFC) HELO should be a FQDN and should match DNS definition. So maybe we should add a new field for a custom HELO in the advanced setup pages ? By default, IP could be sent (as it is now) but if this field is used, it should be used for HELO.
Per RFC 821 on HELO: "The argument field contains the host name of the sender-SMTP."
Anything that rejects a hostname because of DNS or other issues is highly unlikely to accept an IP, so just changing this to FQDN is safe.
Fix commited.
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