IAB voucher codes e-mail not working

[DanWBC]

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Dear IAB,

IAB has set up a mailing list to address voucher code issues few months ago and it's already not working:

This is the mail delivery agent at messagelabs.com.
I was not able to deliver your message to the following addresses.

<vouchercode@iabuk.net>:
194.106.46.143 does not like recipient.
Remote host said: 550 5.1.1 User unknown

I've got a reply from Dan Redfearn that it should be in order, but it doesn't seem to be an Dan has left on vacation.

Please could someone send a test message to this list to see if it works and post the result here?

Thanks,

Dan

[Mogga]

194.106.46.143 does not like recipient.
Remote host said: 550 5.1.1 User unknown