version: 1.4.0 MARIADB edition;
Deployed with: Downloadable installer;
distribution name and version: Debian GNU/LINUX 10 (buster) / Kernel: Linux 4.19.0-17-amd64 / x86-64;
Store mail: MySQL;
Web server: Nginx:
Manage mail accounts with iRedAdmin-Pro? no;
Attached is the print of the log;

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Above is our scenario information; We installed iRedMail on our clean server for email service; We created the record at the ISP (registro.br - Brazilian) and pointed it to our server; We followed the installation from the following link: https://www.linuxbabe.com/mail-server/u … ail-server and locally it worked, we even received emails, but whenever we send emails, we received the message as an attachment. The email does not reach the recipient. What are we doing wrong?

We appreciate any help;