[swinog] hotmail issues since 18/1 ?

Hoi zäme I have a couple of customers complaining they are unable to send emails to hotmail - typically they see rejects such as this: It doesn't affect all customers and checking our logs, it appears to have started 18/1. Prior to that we had no problems delivering outbound mails to hotmail, since then I see 149 bounces with the message above). The customers are on dynamic ranges from Swisscom, UPC and e.g. Virgin (in the UK). Has anyone seen something similar? -- Per Jessen, Zürich (-0.1°C) http://www.dns24.ch/ - your free DNS host, made in Switzerland.