The documentation states that you can either use an existing SMTP provider or sendmail with the local server but the former solution didn't work for me with GMail or the SMTP server at my web host. And, from a quick Google search for sendmail, I got the impression that I should stay away from it.
In the end, I opted to use a simple Python-based SMTP server by Les Smithson to debug my mail calls locally.
It's very simple to use:
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I've been tagging messages with the label "Singularity Badges" in GMail as the emails were coming in (note to self: next time, also reply to the message at this point and they won't pile up!) So I thought I'd fire up Mail app, select all the messages with the label, hit Reply and Bob's your uncle.