Thank you for the suggested solution but I already have oralab.com as a co-domain of www.oralab.com
configured exactly the way you described but am not able to actually send e-mail to firstname.lastname@example.org
, only to email@example.com
I tried sending e-mail from one oralab.com e-mail account to another oralab.com e-mail account and even this fails.
Is there some config file that I can verify the contents of to confirm that oralab.com is correctly setup as an alias domain for webmail.oralab.com as the /etc/postfix/virtusertable file do not have any such mappings?