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ISPs are filtering incoming emails based on:
Subject, TO, FROM and message body and using inappropriate words like "Viagra" will results in your mail being deleted.
 See: How Email Works
My email verifier program confirmed that my emails addresses are good but they still got bounced?

Most SMTP servers will accept email addressed to just about anyone within their domain and figure out later that the user does not exist and can't be delivered--meaning that the mail server will first accept the message and bounce it later or considered as spam and delete it without notifying the sender.


Spammers are know to use software that generate random email addresses for spamming, hence, ISPs filters may assumed that the sender is trying to spam.

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.

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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-to-try from  

Keep in mind that many email program like Eudora, Hotmail, Gmail, Yahoo, Outlook or Outlook express being used to receive messages by default don't usually display the information you have keyed into your email program "User Information" Name: field


Many recipients email program will usually display your
"Mail Account" field information at their FROM field (unless they have set their email program to display all headers).

Note:  Below "General information" picture are from MS Outlook, Outlook Express and can be pulled-up by going to >Tools, >Accounts, >Properties

Remember this, various email programs may call below MS Outlook "Mail Account" by a

different name-- the best solution is that after creating your message, send it back to yourself to ensure that you have selected the correct field and have input the desired text information.

The above "General information" picture are from MS Outlook,
Outlook Express and can be pulled-up by going to...
>Tools, >Accounts, >Properties

The Mail Account field are the information that will appear in your recipient email program "From" field--so enter relevant  info that entice your recipient to read your message.

Note: There are no restrictions on what sort of text information you can enter into the "Mail Account" field, you may use an email address that's different from the "User information" E-mail address: field or Reply address: field

You may even use a different email address at the "Reply address:" field if you want the recipient to reply to that email address instead of the "E-mail address:" that was used to send the message in the first place.

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

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




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