Hello, I have a weird issue. Whenever I send an email from Outlook or Gmail to my mailcow inbox I recieve it within 2-3 seconds which is perfect. But whenever I try to register at a something online it takes 5-10 minutes before the mail is visible in roundcube.
I tried registering at Mega.nz and the activation mail arrived 8 minutes later. In roundcube it says the mail arrived at “14:32” but it was not visible for me before after 14:40. I also tried registering at a few other sites with the same problem.