I have a client that I have walked through setting up her Outlook to access her POP3 email account. She connects to AOL first then fires up Outlook. The mail server that we want to access is not AOL. She receives her mail perfectly. However, when she tries to send the mail, she gets an error message to the effect that she was rejected as the sender (?) It appears it is trying to user her user id and password for the other mail server and failing. I have been through all of her settings and configurations but I have not been able to find a way to correct it so that her mail goes through the other mail server. Can anyone provide some insight into this?
If the outgoing mail SMTP mail server is being given a different mail address than the given ISP mail account address then there might be a problem. For example, if the ISP gave you firstname.lastname@example.org but you're using Outlook to send email@example.com. Some places prohibit this to prevent abuse of their system.
Another key is that you say this person is connecting to AOL and then sending mail through another server. I know a lot of ISP mail servers require you to actually be logged into their service to be able to send mail. In other words, your client can't use AOL to connect to the net and then use another comapny's mail server. This is of course specific to the mail server. Not all systems are set up this way.