Are you stuck while sending an email to your colleague? Or did you receive error code when you were sending the email? If yes then you do not need to make hassle as this error 554 is either related to poor connectivity of internet or due to wrong IMAP or POP settings. Even this error occurs when you are sending multiple emails at a time or due to firewall blocking. Solving AOL error code 554 is simple, but it is advised that taking the help of experts for fixing it. So don't waste time and call aol email customer care numberwhich is available 24 * 7 round the clock to help their users.