AOL SMTP error occurs in a computer due to the wrong username and the password, server address, or server authentication. You should fix this AOL SMTP error as soon as possible. Get the guidelines of experts by calling on the AOL customer support number. This service is always reachable for AOL users. You don’t need to hesitate for dialing this number, all the techies available on this number are generous. And they will definitely provide you with a suitable solution of your problem.