Send email

So I've been configuring a send e-mail node and for some reason it wouldn't send out an e-mail. The node wouldn't error out, but no e-mails were getting sent out. It was driving me crazy until on a whim I decided to remove the variable I had sitting in the subject line to make it dynamic and suddenly it works perfectly. So the e-mail only seems to get sent as long as I don't put an expression of any sort other than a literal string in that subject line. Is this a bug, or is this expected behavior? Assuming it's a bug, can we get it fixed? 

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