To ensure that your email about the “Towards Data Science Machine Learning” course information doesn’t end up in spam folders when sent in bulk, here are a few tips:

1. Use a Recognizable Sender Name and Address: Make sure the sender name and email address are easily recognizable by the recipients. Using a professional and relevant email address can increase the chances of your email being marked as safe.
2. Craft a Relevant Subject Line: The subject line should clearly indicate the purpose of the email and include keywords related to the course and machine learning. Avoid using all capital letters and excessive punctuation, as these can trigger spam filters.
3. Personalize the Content: Whenever possible, personalize the email by addressing recipients by their names. Use merge tags to insert the recipient’s name dynamically into the email content.
4. Avoid Spam Trigger Words: Be cautious about using words and phrases commonly associated with spam emails. Some examples include “urgent,” “free,” “guaranteed,” and “act now.”
5. Balanced Text and Images: Avoid sending emails that are heavily image-based. Use a good balance of text and images to ensure that the email is not flagged as suspicious.
6. Provide Unsubscribe Option: Include a clear and easy-to-find option for recipients to unsubscribe from further emails. This can help improve the reputation of your sender domain.
7. Include Plain Text Version: Always include a plain text version of your email in addition to the HTML version. Some spam filters prefer plain text content.
8. Avoid Attachments: Refrain from attaching large files to your email, as this can trigger spam filters. Instead, include links to relevant resources or documents hosted online.
9. Authenticate Your Domain: Implement Sender Policy Framework (SPF), DomainKeys Identified Mail (DKIM), and Domain-based Message Authentication, Reporting, and Conformance (DMARC) to verify the authenticity of your email domain.
10. Use a Reputable Email Service: Consider using a reputable email service provider that has a good track record of delivering emails to inboxes and avoiding spam folders.