Hello! I use the Bat for email. Mail, and Yandex takes for a normal letter, but Google throws in spam. Moreover, the letter the usual "hi, how are you?". Use the SMTP server. What could be the problem?
Google is quite demanding on the mail servers, the last time requires not only SPF, correct hostname, TLS, and DKIM but. So no diagnosis from your writing - why it is impossible to understand. You need to look official e-mail headers and to analyze, to look for possible causes of such behavior.