On 28 Aug 2013, Michael Richter wrote:
Trying 195.186.227.50... Connected to mxzhh.bluewin.ch. Escape character is '^]'. 421 4.4.5 Service unavailable, concurrency limit reached.
We see the mail queues growing with undeliverable mails for bluewin.ch.
The same also happened on monday before Swisscom was unreachable. This reminds me of 2011 when they were attacked.
Regards
Oliver