Message Delivery Delay #2

Seeing the logs from my mail server I see that the email is bounced back. It says that your mail server rejected it because I am not authorized. I did everything I could on my end. Could you maybe register a different email address? 
We are sending out a lot of newsletters and we only have problems sending to your mail server.

It's really strange.
Maybe you can change my mail in profile or DB?

Yes, I can change it, just give me the email you would like.

Change please "valeros@bigmir.net" to "valeros08@gmail.com"

Ok, I changed it in the database, that is your new username now (the password is the same) and you will be getting newsletters on gmail now.