[XML-SIG] Undelivered mail

[undelivered at unknown.com]

I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.

Error in sending aandrade at empresas-yv.com.
And the server said:
554 5.7.1 Rejected 168.226.81.100 found in dnsbl.sorbs.net
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