Appear email from another domain name in tracking center

[thien_nv]

Hi guys,
Recently, I saw a strange domain name appear in the tracking center that is not mine.
Same as attached picture.
Appeared a domain name vuanem.com send mail to vuanem.vn.
But it is reject
In the mail proxy I just only set up my only domain name is mydomain.com.
i think it looks like someone has configured this domain to be forwarded by my proxmox mail gateway?
Can someone explain this to me?
Is there any way to fix this?

 

[dcsapak]

can you post the mail.log of such an email? (click on the '+' symbol )

 

[thien_nv]

can you post the mail.log of such an email? (click on the '+' symbol )

Thanks @dcsapak , it is here
-----------------------------------------
Aug 5 14:26:49 gateway postfix/smtpd[14079]: connect from mail-lf1-f71.google.com[209.85.167.71]
Aug 5 14:26:51 gateway postfix/smtpd[14079]: NOQUEUE: reject: RCPT from mail-lf1-f71.google.com[209.85.167.71]: 554 5.7.1 <ba.do@vuanem.vn>: Relay access denied; from=<vanphong+bncBDRIDUN23UHRBDH3TWEAMGQEIH4KNOI@vuanem.com> to=<ba.do@vuanem.vn> proto=ESMTP helo=<mail-lf1-f71.google.com>
Aug 5 14:26:52 gateway postfix/smtpd[14079]: disconnect from mail-lf1-f71.google.com[209.85.167.71] ehlo=2 starttls=1 mail=1 rcpt=0/1 bdat=0/1 quit=1 commands=5/7

 

[dcsapak]

Relay access denied

your mailgateway correclty denies the mail because it is not in the domains to be relayed...

maybe the admin of 'vuanem.vn' mistyped the mx info?

 

[thien_nv]

your mailgateway correclty denies the mail because it is not in the domains to be relayed...

maybe the admin of 'vuanem.vn' mistyped the mx info?

thank for reply.
I think so, too.
but this messes with my tracking center.
but it's okay if there's no problem