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Merchium hosted email accounts
Keeping in mind that Merchium is a SaaS solution, when it comes to hosted emails, merchants currently have no other choice but to find another service provider to host their email and point the MX records of their domain name accordingly.
If Merchium provided hosted email accounts, it would go one step further to being a complete solution for an online business.
Also, here is a link to Bigcommerce's equivalent.
Bigcommerce recommends using 3rd party email services in the article you posted and they do not support hosted emails for the stores created after March 16, 2015.
So, we do not think this is a useful feature at this moment.