Unable to use @mailbox alias in IMAP/SMTP
I've set up an alias for my account as per alias setup guide; like "firstname.lastname@example.org" and "email@example.com". Out of this, first address "example.a" is marked primary and "example.b" is alias. Using device setup guide, I am successfully able to use "example.a" to set up IMAP/SMTP account in my email client; but I'm unable to use alias ("example.b@mailbox") for IMAP or SMTP. Is it supposed to work that way or am I missing something? I've seen iOS alias setup guide as well, but it doesn't help.