[ontolog-forum] failed email

[Thomas Johnston <tmj44p@xxxxxxx>]

<<<

Sorry, we were unable to deliver your message to the following address.

<ontolog-forum@xxxxxxxxxxxxxxxx>:
Remote host said:
554 Service unavailable; Client host [98.138.91.70] blocked using safe.dnsbl.sorbs.net; Currently Sending Spam See:http://www.sorbs.net/lookup.shtml?98.138.91.70
[RCPT_TO]

>>>

Is there some reason these emails failed, and got a "currently sending spam" message?

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