BounceBack Email caught in a loop

[thereuare]

I had a user register with an invalid email address so i receive a bounceback email informing me of the invalid email address.

The issue is that the registration email was then attempted to resend every hour, which lead to me receiving bounceback emails every hour (and could eventually lead to email server getting blocked).

Has anyone seen this or something similar before?  In the past I would get email bounceback from invalid addresses and that was it... it was a 'one and done'.

Is resending the bouncback email part of my server sending emails or IPB?  Are there solutions (built into IPB or custom code) to check emails before being sent to see if the email is valid? 

The main concern is that our server does not get blocked and result in users not  receiving emails.

[Marc]

This will be you server. We wouldnt attempt to send an email every hour. We send an email to your email service, and once its gone its in the hands of your email provider

[Randy Calvert]

You most likely have your board's Reply-To address set to an email address that sends an auto-reply.  

So if IPB sends an email which bounces, the bounce comes back to your inbox which gets the auto-reply, which then triggers a separate bounce.

Edited March 22 by Randy Calvert