Invalid addresses left in the queue to which repeated attempts are made to send

ℹ️ Support
1

How long does it try to send mail to addresses with errors, how can this be stopped and can it be defined somewhere that the addresses would be marked on a black list so that the same thing does not happen again?

Error sending email to doe.john@doe.tld SMTP Error: The following recipients failed: doe.john@doe.tld: The mail server could not deliver mail to doe.john@doe.tld. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries.

2

When sending a campaign, bounces should be directed to the message envelope mailbox.
When using Advanced bounce rules, you can indicate how to handle a bounce by setting up rules, i.e. in your case, the rule might be ‘could not deliver’, specifying ‘add email to blacklist and delete bounce’.