How to resolve an Internal Mail Error when looting mail.
How and when BoA or Heirloom items be sent to another character on the Blizzard Account.
Troubleshooting World of Warcraft in-game mail issues.
Gold and items cannot be sent to another realm or faction
Phishing scams can take many forms—fake websites, suspicious emails, and threatening in-game whispers are the most common types.
More information on returned mail
Troubleshooting steps for missing Auction House mail reports
Troubleshooting mail sent without adding a CoD.
Information on how long it may take for different kinds of mail to be delivered.