[derefr]

"The particular node of our server farm that your account is hosted on is currently experiencing errors" sounds a little too technical to me. Also, "GMail is having a problem" might lead them to believe that, say, if they send email from their hotmail account to somebody else's gmail, they wouldn't get it.

[aneesh]

Better & more direct would be "We're having problems with your GMail account"

That way they take responsibility for it, rather than blaming the user, or blaming no one.

[cstejerean]

I like it, hopefully someone from GMail sees this thread.

[gunderson]

that's true, that is a good point.