this has nothing to do with the new look or anything.
The issue is the mail server behind the website. Basically what is happening is that when you make a post, there is most likely a topic reply notification for someone. This means that as soon as you make a post, eGriz.com is trying to send an email to a user telling them of your post.
Right now the mail server is down, thus the error (it is saying that it couldn't send the email).
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