64.71.235.151 is blacklisted by lashback
A spammer was able to get some mail out, and made(or part of) some other issues as well 
webmail is not available in this server?
yes it is, but server is down, check status forums, we are updating as possible there.
our customers has some issues with this server again
They may have noticed a connection interruption, as there was service restart for some more spam cleanup.
isn’t there any way to localize from where this spam is comming? The issue is for 3 days: 1 day for disk issue, 1 day for spam and today again for spam