To ensure a successful SMTP handshake in your email marketing efforts, you should:
Authenticate: Use proper authentication methods like SPF, DKIM, and DMARC to establish trust with the receiving server. Monitor: Regularly monitor your email server logs to identify and resolve handshake issues. Optimize: Optimize your email content and structure to comply with SMTP standards. Test: Conduct regular email testing to ensure that your emails are being delivered successfully.