Mailscale has been a no brainer. I was paying the subscription price for only 5 email accounts and now for the same price I get access to 50 email accounts which I didn't have to set up myself. The team is really quick at fixing issues. For the 6 months that I have been using mail scale I have only had 2 issues and these were fixed pretty quick. I definitely recommend mailscale to whoever uses email marketing.
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