No display name with custom email domain
I have set up 2 custom domain names to be used with my e-mails. My full name/display name is stored correctly for both custom emails in my iCloud email settings.
Now, if I send an e-mail message with the mail app on my Macbook Pro, with any of these custom domains, on the receiver's end my full name is not displayed together with my message, only my email address.
If I send messages from my iPad or iPhone with any of these two custom domain accounts, my full name is displayed correctly. So, the issue seems related to the mail app on my MacBook.
Any thoughts?