Cannot connect to Postfix on port 587

Hi there,

I have installed Postfix on a droplet, and configured it to work on ports 25 and 587.

I’m unable to make a connection remotely.

If I do the following from the droplet itself:

> telnet localhost 587

I get a reply from Postfix.

However if from my either my local system or the droplet itself I do:

> telnet 587

I get:

Unable to connect to remote host: Connection refused

I have read that DigitalOcean often block ports 25 and 587 by default, but I have contacted support and been assured by multiple agents that they are not blocking those ports on our droplet.

Is there anything else I can try?


Submit an answer

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!

Sign In or Sign Up to Answer

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Bobby Iliev
Site Moderator
Site Moderator badge
January 30, 2020
Accepted Answer


This sounds like that you might have a firewall on your Droplet. If this is the case you need to open port 587 for incoming and outgoing TCP connections, for example if you are using Ubuntu and if you have UFW enabled, you could open the 587 port with this command:

sudo ufw allow 587/tcp

Also, check the if Postfix is binding correctly on

  1. netstat -plant | grep 587


tcp        0      0*               LISTEN      1161/postfix

Let me know how it goes! Regards, Bobby

Try DigitalOcean for free

Click below to sign up and get $200 of credit to try our products over 60 days!

Sign up

Featured on Community

Get our biweekly newsletter

Sign up for Infrastructure as a Newsletter.

Hollie's Hub for Good

Working on improving health and education, reducing inequality, and spurring economic growth? We'd like to help.

Become a contributor

Get paid to write technical tutorials and select a tech-focused charity to receive a matching donation.

Welcome to the developer cloud

DigitalOcean makes it simple to launch in the cloud and scale up as you grow — whether you're running one virtual machine or ten thousand.

Learn more
DigitalOcean Cloud Control Panel