| i cannot deliver an email; it sends sometimes and not others. this is the message i get:? The reason for the problem:5.1.0 - Unknown address error 550-'5.7.0 Your server IP address is in the SORBS DNSBL database, bye'Action: failedStatus: 5.0.0 (permanent failure)Diagnostic-Code: smtp; 5.1.0 - Unknown address error 550-'5.7.0 Your server IP address is in the SORBS DNSBL database, bye' (delivery attempts: 0)Reporting-MTA: dns; mk-smarthost-2.mail.uk.tiscali.comIs the other user blocking my email or is this a problem with the servers? |