Have you enabled mail ssl in hestia? If yes, mail.domain.tld with SSL/TLS on Port 995 (and without startssl) should work out of the box.
Personaly, I would stay on Microsoft Exchange Online - e-mail delivery is not worth the hassle 
.
Have you enabled mail ssl in hestia? If yes, mail.domain.tld with SSL/TLS on Port 995 (and without startssl) should work out of the box.
Personaly, I would stay on Microsoft Exchange Online - e-mail delivery is not worth the hassle .