Gandi.net Groups

I created the Gandi Mail mailbox to my existing domain (syyrakki.com)
and after that the email forwarding stopped working. I assume there is
a connection. The symptoms are as follows:
----------
Hi. This is the qmail-send program at <my service provider>.
I'm afraid I wasn't able to deliver your message to the following
addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<my email-alias in Gandi>:
217.70.184.6 does not like recipient.
Remote host said: 550 5.1.1 <my email-alias in Gandi>: Recipient address
rejected: undeliverable address: host mboxes-v.mgt.gandi.net[10.0.22.70]
said: 550 5.1.1 <my email where the mail is forwardedt>: Recipient
address rejected: User unknown in virtual mailbox table (in reply to
RCPT TO command)
Giving up on 217.70.184.6.
-------------
- The <my email where the mail is forwarded> is a valid email address -
works when mailed directly.
- I am using Gandi DNS
- Everything worked perfectly for years before I tested Gandi Mail
- I tried deleting the mailbox - no effect
- I tried creating new forward - the same error happens
- In the control panel it looks like activating the mail changes the DNS
zone (domain without mail shows Gandi Zone, with mail shows
2007.06.18-gandimail) and I could not find a way to reverse this
process.

The forwards that now don't work are used by many people who obviously
are at the moment quite annoyed. OK, I was stupid-stupid-stupid to test
the Gandi mail with domain in production use but I stupidly thought only
the new functionality was beta...

I sent a support request but maybe someone can offer some advice here?

Matti