pgAdmin 4 | Changing Mail From information!

Dear all, I'm new from pgAdmin4 (I normally used pgAdmin3 in the past). Now, I'm deploy a server of pgAdmin4 using docker technology (https://hub.docker.com/r/chorss/docker-pgadmin4/). I've deployed successfully. But noư I face an issue. Our mail-server restricts to send email if the sender does not match with authenticate user (see log below). I've searched in the config and just found out the config about mail server and mail user/password. I can't find the config mail from or mail template. Could you please help me where I can modify it? ************************************************************************************************ reply: b'235 2.7.0 Authentication successful\r\n' reply: retcode (235); Msg: b'2.7.0 Authentication successful' send: 'mail FROM: size=1191\r\n' reply: b'250 2.1.0 Ok\r\n' reply: retcode (250); Msg: b'2.1.0 Ok' send: 'rcpt TO:\r\n' reply: b'553 5.7.1 : Sender address rejected: not owned by user mail_demo@digi-texx.vn\r\n' reply: retcode (553); Msg: b'5.7.1 : Sender address rejected: not owned by user mail_demo@digi-texx.vn' send: 'rset\r\n' reply: b'250 2.0.0 Ok\r\n' reply: retcode (250); Msg: b'2.0.0 Ok' send: 'quit\r\n' reply: b'221 2.0.0 Bye\r\n' reply: retcode (221); Msg: b'2.0.0 Bye' ************************************************************************************************ Looking forward to your feedback. Thank you so much and best regards, Đỗ Ngọc Trí Cường (Mr.) Software Development Dept. Mobile: +84 9 3800 3394 Phone: +84 28 3715 6322 | Ext. 540 Email: dntcuong@digi-texx.vn DIGI-TEXX | a global BPO provider Address : Anna Building, Quang Trung Software City, District. 12, Ho Chi Minh City, Vietnam Website: www.digi-texx.vn IMPORTANT NOTICE: *This e-mail and any attachments may contain confidential and/or privileged information. If you are not the intended recipient, please delete it and notify the sender immediately. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden. *Please consider the environment before printing.