I have (maybe) an odd experience with a Danish email domain.
It all starts with that I want to test my code so it could handle errors.
I have a homepage with a form where my customers can submit their emails.
Sometimes my customers sends me mails with an email address like my.customer@gmail.dk SIGH
In PHP mail(), I use the additional parameters “-f bounce@my.domain.dk” such that I should get an error if the mail could not be delivered.
When I send an email to the domain my.customer@gmai.com or my.customer@gmailzzz.com I will get a SMTP 550 error.
But when I send an email to my.customer@gmail.dk I will not get a response at all.
I have tried to look if the domain gmail.dk is taken at http://www.dk-hostmaster.dk but it seems not to be. So why do I not get an error in return when sending an email to gmail.dk ???
https://www.dk-hostmaster.dk/index.php?id=42&query=gmail.dk&submit=S%F8g
It is owned already by Google inc. They may have a catch-all set up, or more likely, no bounces returning at all?