I can't see how MX or PTR/Reverse DNS records might influence this...
Can you post the email they sent back to you (to the wrong server)?
Can you post the email they sent back to you (to the wrong server)?
My Sentora Resources
[Module] Mail Quota Count | Vagrant Box with Sentora
Graphic and Web Design. Development.
www.vanguardly.com
[Module] Mail Quota Count | Vagrant Box with Sentora
Graphic and Web Design. Development.
www.vanguardly.com