Sitizen

One of my weblogs called sheida is much older than this weblog, so I used to use that one as my main email address and my main email address was webmaster[@]sheida.com, but after receiving emails from webmaster[@]sheida.com which was sent to a lot of people (it was sent to unsolicited list) for 4 days, now no one can not send a email to webmaster[@]sheida.com.
Have u seen this ever before ? this is so strange to me, I did see emails being categorized as spam but I’ve never seen such a thing before. see what google and yahoo says after sending emails to webmaster[@]sheida.com

Gmail :

This is an automatically generated Delivery Status Notification

THIS IS A WARNING MESSAGE ONLY.

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

Delivery to the following recipient has been delayed:

     webmaster[@]sheida.com

Message will be retried for 2 more day(s)

Yahoo :

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.

<webmaster[@]sheida.com>:
Sorry, I couldn't find any host by that name. (#4.1.2)
I'm not going to try again; this message has been in the queue too
long.