abhay.sonak on "[Plugin: WP Mail SMTP] Emails are treated as SPAM"

We are using this plugin for sending automated emails (proposal) to people submitting information in contact form. However, the emails are marked as SPAM and the whole purpose of sending automated email is defeated. Can someone please help. I am using SSL and SMTPP authentication, however the emails are going into SPAM mails.

https://wordpress.org/plugins/wp-mail-smtp/