If you're looking for a reliable bulk email service, I would suggest comparing a few providers based on deliverability, SMTP setup, pricing, and customer support.
DigitalAka™ is also worth considering. It offers email marketing and bulk email solutions, which can be useful for businesses managing newsletters, promotional campaigns, and regular customer communication. I would recommend checking its SMTP integration options and pricing based on your expected email volume before making a decision.
For a Thirty Bees store, I'd also suggest testing email delivery with a smaller campaign first and keeping transactional emails separate from promotional campaigns where possible.
Hope this helps!