I never received any emails from your system when I signed up for both a wildcard and a single site certificates. The reason is that your system and even the support site is not included in your domain’s SPF records. So my server rejects them because that’s the correct policy when a site has SPF records set that don’t match the sending domain. Here is your SPF setting:
Note I have also opened a trouble ticket, to which I received a canned response about making sure that my spam filters aren’t deleting your email. My spam filters only tag email, never delete. The email is never being received by my server because it checks your SPF record, sees that your IP doesn’t match it and rejects the message.
As you said, the SPF record on comodo.com is
“v=spf1 mx include:psoft.od.ua include:blackberryv.comodo.com include:spf1.comodo.com include:spf2.comodo.com include:spf3.comodo.com include:spf4.comodo.com -all”
recursing into spf1.comodo.com I see an SPF of
“v=spf1 ip4:184.108.40.206/28 ip4:220.127.116.11/29 ip4:18.104.22.168/26 -all”
So checking the originating IP, I see that 22.214.171.124 is within the IP range given by the final element given in the SPF record for spf1.comodo.com (126.96.36.199/26).
I am running qmail. The server that received the mail was forwarding it to my other server, which checked the SPF records again and rejected it (as my first server isn’t in your SPF list). I have no whitelisted my other server so it won’t be a problem anymore.