Emails with my corporate email info[@]adlab.ee many fall into the spam.
I screwed the mail servers of Yandex. Support say they cannot help - it is necessary to solve the problem on the side of the mail servers of email recipients.
How to find out the mail server of the recipients of my letters, if they all mail to their domain zone type info@domen_firmy.ru
The logs sent letters can you learn?
*By the way - I don't do e-mail and send individual letters to customers. The problem is even with those with whom I had already informed correspondence.