Thanks for sharing! Cmd+shift+T is super useful... just wrote it on a post-it!
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We're using Postmark (we send about 500 emails/month). Very easy to set up. We were hesitating with Mailgun but it's not really optimized for marketers/ business guys [there is no template builder like mailchimp/postmark has].
Hope it helps.
How good is Postmark's template builder vs. say ones in Mailchimp?