Emails Sent from Alias Domain Not Being Received

[nexusiceland]

I hope this message finds you well. I'm currently encountering an issue with email delivery. Specifically, emails sent from an alias domain are not being received by the intended recipients.
I've reviewed the email configuration, checked DNS records, and ensured that there are no issues with the email server. However, the problem persists.
If anyone in the community has experience with emails not being received when sent from an alias domain or has insights into potential solutions, I would greatly appreciate your assistance.

 

[Idukkikkaran]

Do the emails actually leave the mail server? What does the email log say for one of the emails?