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Bounced or undeliverable mails are quite normal due to reasons; Busy mailbox, blocked domain, mailbox full, temporary suspended, mailbox over limit...   

Why is it always that some email addresses can't be sent off & on?

ISPs are filtering incoming emails based on: Subject, TO, FROM, as well as message body, therefore, using inappropriate wordings like: free, $$$, 1-800 etc., in your mails can result in them being deleted off & on.

It is also possible that your customers mail client (ie: Eudora, Gmail, Hotmail, Outlook,
 

etc., and/or their corporate mail server are using filter device that delete mails off & on with inappropriate wordings like: free, $$$, etc., in your mail: Subject, TO, FROM, as well as message body that result in them being deleted.
See Email Filtering
 

  
 
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Keep in mind that many email program (by default) doesn't show the FROM: name that you provide, it only display to the reader 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 it 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 on many recipients email program.

Keep in mind that many email program like Eudora, Hotmail, Gmail, Yahoo, Outlook or Outlook express by default don't usually display the information you have keyed into your email program "User Information" Name: field but will display the information keyed into the "Mail Account": Field

 
 
If your off and on refers to undeliverable mails

Bounced or undeliverable mails from your own or ISPs mail server are quite normal due to various reason like; Busy mailbox, blocked domain, mailbox full, account temporary suspended, mailbox over limit, etc.--these are know as soft bounce. Therefore, bounced or undeliverable mails off & on does not necessarily mean that your email addresses are invalid.
 
 
Soft bounced refers to; mailbox full, mail server down, network busy, (550 Requested action not taken) etc.

Hard bounced refers to non-existing users (550 address not allowed or Requested action not taken) or that mail servers or email clients have filtering device that stimulate and return mails as hard bounced.
See: SMTP return codes error

Free to try filtering programs like:

 

 mailwasher.net allow users to auto delete and returned undeliverable emails simulated as hard bounced so that the sender can delete or remove your email address from their mailing list.

These powerful freeware programs allows *wildcard filtering for the: Subject line, TO, FROM, email domain and message body. For more info about why your emails are bounced... See: How Email Works

Important Notes: If you are using your own mail server program and facing bounced, undeliverable or deleted mails by AOL, Yahoo, Hotmail, etc. See: Mail Server FAQs
   
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