Therefore, "address verifier" application can only test, check, verify, or validate an email address domain for syntactical (typo etc.) errors, non-existing or invalid domains and not if the user actually exist--meaning that there is no way to solve and verify an email until it was sent and got bounced or undelivered.

Filtering programs are also available for users to auto delete and returned undeliverable emails (stimulated) as hard bounced, therefore, bounced mail may not necessarily means that recipients are non-existence. These powerful programs also allows *wildcard filtering for the: Subject line, TO, FROM, email domain and message body, available free from: www.mailwasher.net

Keep in mind that AOL doesn't show the FROM: name that you provide, it only shows readers the FROM address, so make sure you are not sending with a typical spam like looking email address like this example: jonessnews_1234@myemaildomain.com
that is as good as telling the recipient or the spam filters "you can delete this mail".

From: name? It is the name that you have enter into your email client ie: Outlook Express, Name: field--(start-up outlook, >Tools, >Accounts, >Properties and at the "User Information" Name: field--that's the From: name that won't show-up for AOL recipients and the FROM address? E-Mail address: field -- That's what will show-up for AOL recipients.

For more info about why your mails get bounced?
See: How Email Works

If you are using your own mail server program...
See: Mail Server FAQs