About bounced emails: are send outs repeated even if the email bounced? Do we have to delete or unsubscribe those emails?

Emails that have bounced will not receive any other communication from you. However, all the leads actions will still be registered in PUBLITRAC.
If one of these actions modify the email address, there will be a new attempt during the next send out.

If however the lead unsubscribed themselves or considers your send out as SPAM, no other communication will be sent.