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VestaCP – Can not Send email – SMTP Error (550) – Invalid HELO name

Error:

SMTP Error (550): Failed to set sender “someone@example.com” (Access denied – Invalid HELO name (See RFC2821 4.1.3)).

You should add smtp helo name in the mail configuration. Find the file config.inc.php and edit it

nano /etc/roundcube/config.inc.php

add the line.

$config['smtp_helo_host'] = 'localhost';

Now login to your mail client and test the outgoing mail by sending one.

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