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 server.domain.com 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?
Thanks,
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!
Accepted Answer
Hello,
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 0.0.0.0:
- netstat -plant | grep 587
Output:
tcp 0 0 0.0.0.0:587 0.0.0.0:* LISTEN 1161/postfix
Let me know how it goes! Regards, Bobby
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.