Why Gmail Flags Student Event Certificates
Many organizers use a Python script with smtplib connected to a clubpresident2026@gmail.com address. After sending 70 emails:
- Google blocks the account for 24 hours for violating outbound bulk thresholds.
- Subsequent emails land directly in attendee "Spam" or "Promotions" folders.
The Professional Infrastructure Approach
- Authenticated Transactional Endpoints: Platforms like Spark utilize dedicated transactional email services (like Resend) with configured SPF, DKIM, and DMARC DNS records.
- Link Over Heavy Attachments: Rather than sending a 4 MB PDF attachment that triggers corporate spam filters, send a secure, direct download link to the attendee's certificate pass.
Topics covered in this guide:
#Email Deliverability#Spam Filters#Certificates#DevOps
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