Strange entries in exim_mainlog?

I have started seeing entries such as the one below in exim_mainlog recently. Servernames, email addrs. and ip addresses have been changed

2005-01-12 05:02:58 H=servername.domainname.com (localhost.localhost) [xxx.xxx.xxx.xxx]:51605 I=[127.0.0.100]:25 F=<xxxxxxx@yahoo.de> rejected RCPT <xxxx@***********>: servername.domainname.com (localhost.localhost) [xxx.xxx.xxx.xxx]:51605 is currently not permitted to relay through this server. Perhaps you have not logged into the pop/imap server in the last 30 minutes or do not have SMTP Authentication turned on in your email client.
Can someone explain what this could mean. Of course I am afraid it is a spammer on the server and if so need to figure out how it is being sent.

 

 

 

 

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