Here are a couple of things that can be improved in the sitepoint email notification:
There is a lot of padding
There is extra/repeated information

Could the emails omit some padding, in order to improve readability?
Could the introduction be made more consise? For example

From Sitepoint,
You have received a PM, which can be accessed here: [link]

All the best,
SitePoint Forums

OR

From Sitepoint,
You have received a PM:
*Message info*
*Sender*
*Message*

All the best,
SitePoint Forums

Real edited example:
DO NOT REPLY TO THIS EMAIL!

***************************



Dear [edited],



You have received a new private message at SitePoint Forums from [edited], entitled "[edited]".



To read the original version, respond to, or delete this message, you must log in here:

http://www.sitepoint.com/forums/private.php



This is the message that was sent:

***************



---Quote (Originally by [edited])---
[edited]
---End Quote---
[edited]

***************



Again, please do not reply to this email. You must go to the following page to reply to this private message:

http://www.sitepoint.com/forums/private.php



All the best,

SitePoint Forums