I only use my LAMP based setup to send outbound mail and have another mail server to handle inbound mail.
I wanted to understand (for security reasons) how I could disable sendmail listening on port 25.
I’m running the LAMP image: Ubuntu Sendmail 8.14
This textbox defaults to using Markdown to format your answer.
You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!
Hey Jason, <br> <br>You could setup default firewall rules that allow outgoing connections, but not incoming ones. Assuming you need ports 22 and 80 open, it’s as simple as: <br> <br><pre> <br>ufw default deny incoming <br>ufw default allow outgoing <br>ufw allow ssh <br>ufw allow http <br>ufw enable <br></pre> <br> <br>Check out this article for more info on using ufw to setup firewall rules: <br> <br>https://www.digitalocean.com/community/articles/how-to-setup-a-firewall-with-ufw-on-an-ubuntu-and-debian-cloud-server
Become a contributor for community
Get paid to write technical tutorials and select a tech-focused charity to receive a matching donation.
DigitalOcean Documentation
Full documentation for every DigitalOcean product.
Resources for startups and SMBs
The Wave has everything you need to know about building a business, from raising funding to marketing your product.
The developer cloud
Scale up as you grow — whether you're running one virtual machine or ten thousand.
Get started for free
Sign up and get $200 in credit for your first 60 days with DigitalOcean.*
*This promotional offer applies to new accounts only.