Imports
- github.com/ainsleyclark/go-mail/drivers
- github.com/ainsleyclark/go-mail/mail
- github.com/gabriel-vasile/mimetype
- github.com/hashicorp/go-multierror
- github.com/vanng822/go-premailer/premailer
- github.com/xhit/go-simple-mail/v2
- golang.org/x/oauth2
- golang.org/x/oauth2/google
- google.golang.org/api/gmail/v1
- google.golang.org/api/option