VestaCP – SMTP Error (550) – Invalid HELO name
Your mail client may notice you the following:
SMTP Error (550): Failed to set sender “firstname.lastname@example.org” (Access denied – Invalid HELO name (See RFC2821 4.1.3)).
And the message sending is failed ! right ?
Here is the solution.
You should add smtp helo name in the configuration.
$config['smtp_helo_host'] = 'localhost';
Find the file config.inc.php from your mail client application, and add the line.
Now login to your mail client and test the outgoing mail by sending one.
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