I'm a big fan of mailing lists and specifically email marketing. When well done, it can be extremely effective and it's a rare marketing channel for which you're not dependent on someone else's platform to find clients. You own and control it 100%
As much as I've been using it myself, I'm still a kindergartener in comparison to my friend Bryon McCartney, who wrote a succinct, yet thorough guide on email marketing for Architecture firms.
Take a gander, you're bound to learn something valuable.
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