fwrite connection reset by peer smtp

Hi all,
After I upgraded from CI 2.1.4 to 3.0.1, send mail server occurs errors when I tried to send to nonexistent emails (or not Well Formed E-mail address)

Error detail:
Message: fwrite(): send of 37 bytes failed with errno=104 Connection reset by peer
Message: fwrite(): send of 37 bytes failed with errno=32 Broken pipe

in Email.php library.
I tried to try catch but impossible.
Does anyone has the solution for this.
Please help!

Please upgrade to version 3.0.6, severals email library bug have been fixed.

Keep calm.