mail forwarding error

[parkook]

Dear Sir / Madam
I have setup some mail forwarding and I test them by sending emails to them regularly from the same yahoo email I have, the problem is some of them go through but not all of them.
eg: I forwarded to using your control panel and then after 7days I sent test emails from to every day.

The problem is some of them go through and I receive my test emails into my mailbox at but for the rest I receive error email saying there is no server called parkook.co.uk.
This means that my parkook.co.uk (pointed to your nameserver) is available but not always.
Could you please kindly help me on this matter?

Kind Regards
M Parkook
username: parkook
parkook.ulmb.com

[UnlimitedMB]

Are you sending mail from the same yahoo address that your forwarding to?

[parkook]

I have used 2 yahoo address's sending from the same to receive to the same and also sending from another yahoo address and the resault is the same. Some times i receive them but not always.

[UnlimitedMB]

Can you copy/paste the error message.

[parkook]

From: http://us.i1.yimg.com/us.yimg.com/i/...book_add_1.gifAdd to Address Book
Yahoo! DomainKeys has confirmed that this message was sent by yahoo.com. To:failure notice #message335173425011762313383855005683504003552333 966 { overflow:auto; visibility:hidden }
Hi. This is the qmail-send program at yahoo.com.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.<>:Sorry, I couldn't find any host named parkook.co.uk. (#5.1.2)

[UnlimitedMB]

Does this error email get sent back to you immediately after sending the message or does it take time? if so then how long?

Its a DNS problem but i dont know what it is, or if its on our side or yahoos.
Can you try from gmail or somewhere other then yahoo.

[parkook]

yes the error email gets back to me immediatly after sending it.
Ok I'll try gmail and hotmail.

[parkook]

I have tried it from my other emails like hotmail and gmail and still have the same problem!

[UnlimitedMB]

What is the exact error you get from hotmail and gmail?