Cannot send mail
Sending a mail results in the following message:
Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: Disallowed HELO string.
Modified
Chosen solution
Found the solution in
https://kb.mozillazine.org/Replace_IP_address_with_name_in_headers
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Chosen Solution
Found the solution in
https://kb.mozillazine.org/Replace_IP_address_with_name_in_headers