Hi i am tryng to become working my fax server via email receive.

I created the imap server and its working via ssl with certbot from the log i see fusonpbx connect and download the email correctly
When i trigger the email to fax process https://mydomain/app/fax/fax_emails.php it say:
attachments: messages: - text/plain - 4 *********************** fax message: - length: 4 fax files [0]: *********************** Bad Request [400]
(lengt 4 is a number of letter that i have sendend in this case "test")
After it delete the email on the imap folder so the email reading work i think...
Someone know why it say me bad request?
i sended email as subject [fax], number of telephone
body of email contain only "test" word. i try many attempts like no word, attached only a file nothing seems to be work
On internet there is no documentation about this.
I have no fax in the queue.
There is a way to have a debug log of this process, fs_cli is quiet (i think is relative to fusion web structure)
Fax server sending via web interface work as expected.
Please i'm going crazy.
Thanks in advance.

I created the imap server and its working via ssl with certbot from the log i see fusonpbx connect and download the email correctly
When i trigger the email to fax process https://mydomain/app/fax/fax_emails.php it say:
attachments: messages: - text/plain - 4 *********************** fax message: - length: 4 fax files [0]: *********************** Bad Request [400]
(lengt 4 is a number of letter that i have sendend in this case "test")
After it delete the email on the imap folder so the email reading work i think...
Someone know why it say me bad request?
i sended email as subject [fax], number of telephone
body of email contain only "test" word. i try many attempts like no word, attached only a file nothing seems to be work
On internet there is no documentation about this.
I have no fax in the queue.
There is a way to have a debug log of this process, fs_cli is quiet (i think is relative to fusion web structure)
Fax server sending via web interface work as expected.
Please i'm going crazy.
Thanks in advance.