Mail delivery failed: returning message to sender

[omoe]

After upgrading to 2.0 i get a lot of fail delivery daily ,I never received such emails before upgrading .

Is there something i need to change in the settings or something like that to get it working properly again? .

 

[Chris D]

That particular message would usually indicate that the sender no longer has a valid mailbox. There wouldn't be anything in the software that would cause this, but you may wish to enable automated bounce handling, so the process is handled automatically.