eMails with a domain alias

[puster]

Hi everybody,

I have a domain "domain.tld1" which has a domain alias "domain.tld2".

For both domains there are eMail addresses. Now I do have a problem with the eMail-addresses which are associated with the domain alias. While it is possible to send eMails from these addresses, it is not possible to receive eMails with these eMail-addresses. Sending eMails results in the SMTP error 554.

Has anyone else encountered this problem, or is there a known way around this issue?

Thank you very much for your help.