I've used MyDomain for domain names for about five years. Previously, I had my domains elsewhere but used their free nameserver service, and eventually decided they deserve some of my money.

Today at around 11 AM PST, all my domains effectively went down. MyDomain's nameservers inserted a bunch of bogus addresses into the A and MX (and possibly other) records, leading to things like this (bold indicates bogus entries):

$ host dzhang.com ns1.mydomain.com
Using domain server:
Name: ns1.mydomain.com
Address: 64.94.117.193#53
Aliases:

dzhang.com has address 63.251.171.80
dzhang.com has address 66.150.161.140
dzhang.com has address 69.25.27.173
dzhang.com has address 63.251.171.81
dzhang.com has address 208.99.198.83
dzhang.com has address 66.150.161.141
dzhang.com has address 69.25.27.170
dzhang.com mail is handled by 20 mxin.mxes.net.
dzhang.com mail is handled by 10 mail.icydog.net.
dzhang.com mail is handled by 0 m1.dnsix.com.

This of course breaks all my email since they added a priority 0 MX record, and it sends most web traffic to domain parking pages.

After spending exactly 30 minutes on hold, they told me they knew about the issue and gave an ETA of 3-3.5 hours + propagation. They set the TTL to 86326 (1 day), so at best this will be completely fixed in 27 hours. Great.

Time to find a registrar who isn't completely incompetent...