Relay attempts

These are spammers (or hackers) trying to send email from my server

But this is impossible, because it's configured properly. All failed attempts (since logging started) are listed below.

This list was generated by this simple script:

awk '/Relay access denied/{gsub("shpakovsky", "$(hostname)"); gsub("<", "\\&lt;"); gsub(">", "\\&gt;"); gsub("^unknown", "", $10); print "<tr><td>" $1 " " $2 "</td><td>" $10 "</td><td>" $17 "</td><td>" $18 "</td><td>" $20 "</td></tr>"}' /postfix-logs/mail.log

Where mail.log taken from postfix.