Oracle Cloud Infrastructure Security Zones. It’s important to ensure that the email you send doesn’t end up in spam folders, especially when sending bulk emails. To prevent emails from being marked as spam, you can follow some best practices:

1. Use a Recognizable Sender Name and Address: Ensure that your sender name and email address are recognizable and relevant to the recipients. This increases the likelihood that your emails will be recognized as legitimate.
2. Authenticate Your Domain: Implement Sender Policy Framework (SPF), DomainKeys Identified Mail (DKIM), and Domain-based Message Authentication, Reporting, and Conformance (DMARC) authentication protocols to verify the authenticity of your emails.
3. Craft Relevant and Engaging Content: Create valuable and engaging email content that is relevant to your recipients. Avoid using too many promotional or spammy keywords in your emails.
4. Avoid Using All Caps and Excessive Punctuation: Using excessive capitalization and punctuation can trigger spam filters. Write your subject lines and email content in a balanced and professional manner.
5. Optimize HTML and Text Ratio: Maintain a proper balance between HTML and text content in your emails. Overly HTML-heavy emails can trigger spam filters.
6. Include an Unsubscribe Option: Provide recipients with the option to unsubscribe from your emails. This helps build trust and reduces the likelihood of your emails being marked as spam.
7. Regularly Clean Your Email List: Remove inactive or invalid email addresses from your mailing list to improve deliverability and engagement rates.
8. Avoid Misleading Subject Lines: Ensure that your subject lines accurately reflect the content of your emails. Misleading subject lines can lead to spam complaints.
9. Use a Reliable Email Service Provider: Choose a reputable email service provider that has a good reputation for delivering legitimate emails to recipients’ inboxes.
10. Monitor Email Deliverability: Keep an eye on your email deliverability metrics and take action if you notice a decline in deliverability rates.

Remember that no method can guarantee 100% deliverability to the inbox, but following these best practices can significantly improve your chances of avoiding spam filters and reaching your recipients’ inboxes.