We have the same issue as others.
We can‘t send any mails from our domain d-parts.de.
Tried sending logs to investigation@review.symantec.com but failed with error "554 5.1.2 Recipient address rejected: User unknown".
Please fix problems or set our ip 213.179.142.110 to your global whitelist.
Our mail server IP is not listed at any RBLs and we already checked Symantec‘s advisory from previous posts.
Below is the SMTP log from our server trying to connect to Symantec‘s server. Same problem with any mail addresses using messagelabs.com
SMTP,symantec.com,+,DnsConnectorDelivery 61e74520-c04c-4aac-940f-8c3ed6c76a61;QueueLength=TQ=1;RL=1;.
SMTP,symantec.com,>,"cluster4.us.messagelabs.com[67.219.251.49, 67.219.246.193, 67.219.250.97, 67.219.250.193, 67.219.247.49, 67.219.246.97], cluster4a.us.messagelabs.com[54.174.147.140, 52.73.243.182, 50.19.165.100]"
SMTP,symantec.com,>,Established connection to 67.219.251.49
SMTP,symantec.com,-,Messages: 0 Bytes: 0 (Attempting next target)
SMTP,symantec.com,*,Session Failover; previous session id = 08D696A6F7ADC705; reason = ProtocolError
SMTP,symantec.com,+,DnsConnectorDelivery 61e74520-c04c-4aac-940f-8c3ed6c76a61;QueueLength=TQ=0;AN=1;.
SMTP,symantec.com,>,Established connection to 67.219.246.193
SMTP,symantec.com,-,Messages: 0 Bytes: 0 (Attempting next target)
SMTP,symantec.com,*,Session Failover; previous session id = 08D696A6F7ADC706; reason = ProtocolError
SMTP,symantec.com,+,DnsConnectorDelivery 61e74520-c04c-4aac-940f-8c3ed6c76a61;QueueLength=TQ=0;AN=1;.
SMTP,symantec.com,>,Established connection to 67.219.250.97
SMTP,symantec.com,-,Messages: 0 Bytes: 0 (Attempting next target)
SMTP,symantec.com,*,Session Failover; previous session id = 08D696A6F7ADC707; reason = ProtocolError
SMTP,symantec.com,+,DnsConnectorDelivery 61e74520-c04c-4aac-940f-8c3ed6c76a61;QueueLength=TQ=0;AN=1;.
SMTP,symantec.com,>,Established connection to 67.219.250.193
SMTP,symantec.com,-,Messages: 0 Bytes: 0 (Attempting next target)
SMTP,symantec.com,*,Session Failover; previous session id = 08D696A6F7ADC708; reason = ProtocolError
SMTP,symantec.com,+,DnsConnectorDelivery 61e74520-c04c-4aac-940f-8c3ed6c76a61;QueueLength=TQ=0;AN=1;.
SMTP,symantec.com,>,Established connection to 67.219.247.49
SMTP,symantec.com,-,Messages: 0 Bytes: 0 (Attempting next target)
SMTP,symantec.com,*,Session Failover; previous session id = 08D696A6F7ADC709; reason = ProtocolError
SMTP,symantec.com,+,DnsConnectorDelivery 61e74520-c04c-4aac-940f-8c3ed6c76a61;QueueLength=TQ=0;AN=1;.
SMTP,symantec.com,>,Established connection to 67.219.246.97
SMTP,symantec.com,-,Messages: 0 Bytes: 0 (Attempting next target)
SMTP,symantec.com,*,Session Failover; previous session id = 08D696A6F7ADC70A; reason = ProtocolError
SMTP,symantec.com,+,DnsConnectorDelivery 61e74520-c04c-4aac-940f-8c3ed6c76a61;QueueLength=TQ=0;AN=1;.
SMTP,symantec.com,>,Established connection to 54.174.147.140
SMTP,symantec.com,-,Messages: 0 Bytes: 106 ()