Render's free tier declares war on emails: dev wastes full day debugging 'bugs' that were just sneaky spam blocks

A developer recently experienced a frustrating issue with their email system after deploying their application on Render's free tier. Despite functioning perfectly locally, the password reset emails stopped working, with server logs showing strange errors and no emails being delivered. After hours of debugging and experimenting with different providers and libraries, the developer reached out to Render support, who revealed that the issue was due to recent changes implemented on September 26th, 2025, blocking outbound traffic to SMTP ports 25, 465, and 587 on free web services. This restriction, intended to prevent abuse and reduce spam risks, can be resolved by upgrading to a paid instance or using external email providers like Mailgun or SendGrid. The incident highlights the importance of understanding platform limitations and seeking support when encountering issues, rather than assuming the problem lies with one's own code, and serves as a reminder of the trade-offs between free and paid services in the tech industry.