My Ubuntu Droplet lost all network connectivity after a software update.
Ensure your Droplet’s public and private network interfaces are correctly named eth0 and eth1.
Why is SMTP blocked?
Validated on 2 Oct 2025 • Last edited on 18 Mar 2026
SMTP ports 25, 465, and 587 are blocked on Droplets to prevent spam and other abuses on our platform. This block applies to all Droplets by default and includes traffic passing through a Reserved IP address.
Even if SMTP were available, we strongly recommend against running your own mail server, as self-hosted mail servers are difficult to secure and maintain, frequently get flagged as spam, and require constant monitoring to protect your IP address. Dedicated email platforms manage these challenges for you.
To send mail from services hosted on DigitalOcean, we recommend using a third-party email as a service provider.
Related Topics
Can I have more than one domain on the same Droplet?
Yes, you can point an unlimited number of domains to a single Droplet, and you can serve multiple websites from a single Droplet.
How do I fix a "system not initialized" error on multi-GPU Droplets?
Make sure NVIDIA Fabric Manager is running and has the same version number as the GPU drivers.