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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 DigitalOcean, we recommend using EmailEngine, available through the Marketplace as a 1-Click App.
Heya, @woutervanooijen
The SMTP ports are blocked to prevent SPAM. I’ll recommend you to use a third-party service like SendGrid, Mailgun or EmailEngine to send out your emails.
https://docs.digitalocean.com/support/why-is-smtp-blocked/
Regards
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