[plug] Is this a spam attack?

[Jon Miller]

Just put a server online and within minutes the following showed up in the maillog.
May 13 16:21:26 rhfs1 postfix/smtp[2128]: connect to mx-smtp.goodnet.com[207.98.129.120]: Connection timed out (port 25)
May 13 16:21:26 rhfs1 postfix/smtp[2128]: 5BBB314AC14: to=<tkidd at netzone.com>, relay=none, delay=379, status=deferred (connect to mx-smtp.goodnet.com[207.98.129.120]: Connection timed out)
May 13 16:22:02 rhfs1 postfix/smtp[2148]: C945814ABD9: to=<leardl5 at yahoo.com>, relay=mx2.mail.yahoo.com[64.156.215.5], delay=8849, status=deferred (host mx2.mail.yahoo.com[64.156.215.5] said: 421 VS5-MF Excessive unknown recipients - possible Open Relay http://help.yahoo.com/help/us/mail/spam/spam-18.html (#4.4.5))
May 13 16:22:02 rhfs1 postfix/smtp[2148]: C945814ABD9: to=<leardl5 at yahoo.com>, relay=mx2.mail.yahoo.com[64.156.215.5], delay=8849, status=deferred (lost connection with mx2.mail.yahoo.com[64.156.215.5] while sending RCPT TO)
May 13 16:23:46 rhfs1 postfix/smtp[2151]: connect to mx2.mail.yahoo.com[64.157.4.82]: Connection timed out (port 25)
May 13 16:23:47 rhfs1 postfix/smtp[2151]: 5686D14AB8A: to=<lauraetsu at yahoo.com>, relay=mx1.mail.yahoo.com[64.156.215.5], delay=13559, status=deferred (host mx1.mail.yahoo.com[64.156.215.5] said: 421 VS5-MF Excessive unknown recipients - possible Open Relay http://help.yahoo.com/help/us/mail/spam/spam-18.html (#4.4.5))
May 13 16:23:47 rhfs1 postfix/smtp[2151]: 5686D14AB8A: to=<lauraetsu at yahoo.com>, relay=mx1.mail.yahoo.com[64.156.215.5], delay=13559, status=deferred (lost connection with mx1.mail.yahoo.com[64.156.215.5] while sending RCPT TO)

Is this a spam attack?

Jon L. Miller, MCNE, CNS
Director/Sr Systems Consultant
MMT Networks Pty Ltd
http://www.mmtnetworks.com.au

"I don't know the key to success, but the key to failure
 is trying to please everybody." -Bill Cosby