Seeing unread mail icon on mini map but unable to see it in his inbox

Regaining access to a Battle.net Account when the email is not accessible.

Unable to transfer character due to invisible mail.

How to send gold or items to your characters in another realm or faction

Information about an error when trying to use mail, auction house or trade items

Information about gold or items left behind on a locked Class Trial, or a boosted character that is locked due to a chargeback or refund

Information about a situation where you may not be able to recover the Frigid Timewarped Prism from the mail or you may not receive one after running a Timewalking dungeon

Possible causes and how to fix issues related to sending mail in World of Warcraft

What to do if you want to restore items from a dead Hardcore WoW character.

How to restore items and limitations of this service