How do I do it please?

[Caputo]

Hello, how can I solve this problem so I don't receive these emails anymore?

[Square Wheels]

Does it tell you the email address that was involved?

I have two programs I use, IPS software and a newsletter program (on my server).

When I get a bounced email I go to both programs and set them to not receive email from me any longer.

This can be tedious if you have many of them.

I use these two items to help in the ACP.

This one stops all email communication from IPS

https://www.sosinvision.com.br/index.php?/file/310-stop-all-members-email-notifications/&tab=reviews&sort=newest#review-46

This one is a reminder that shows up at whatever interval you want asking the user to confirm their email.  I set mine to once a year.

https://www.sosinvision.com.br/index.php?/file/91-email-address-confirmation/

There are version 5 options on his site too.

[opentype]

What are the attachments showing? What type of emails are being sent out that cannot be delivered? 
It could be something specific like “Post before Register“ reminders you might want to turn off specifically. 

In general, you rather want to deal with these emails instead of not receiving them in the first place. It tells you about delivery issues you might want to address. If you never see them, you will never know there are problems. 

If you want to get rid of them, you would have to send your community emails from a “no-reply“ address, not your regular inbox. You would usually have to set that up with your domain/hosting provider. They might have a specific function for that, or you would simply use a mailbox that you don’t check regularly. (It helps to add some automated delete function [e.g. after 30 days]. That way you can still check the mails, but you are not wasting space with storing these emails forever.)