How I can open port 25 please ?

Hi @redouanadmer,

Firstly, please make sure you a Mail Service which can send mails. If you are uncertain which one, I’ll recommend using Postfix. DigitalOcean have a pretty good tutorial on the installation and configuration of said Postfix. You can view it here - https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-16-04

Now onto the port. If you are using ufw, to open port 25 you can use the following command

sudo ufw allow 25/tcp

If you are using Iptables, you can use the bellow

iptables -I INPUT -p tcp -m tcp --dport 25 -j ACCEPT

That said, running your own mail server on a Droplet is generally more trouble than it is worth. Deliverability is hard to maintain, IP reputation takes time to build, and you are one spam complaint away from being blacklisted. Most people are better off using a dedicated SMTP service like https://smtpfa.st/, SendGrid, Mailgun, or Postmark and skipping the port unblock request entirely.

Regards, KDSys

Hello all,

It is possible that port 25 is closed for new accounts. This is something we have been doing to reduce spam on our network. Please do not think that we are accusing you of sending spam, it is more that we simply cannot accurately determine who is going to send it.

Stopping spam is a constant fight, so we have implemented some restrictions on newer accounts. To qualify for the ability to send out email, we do require accounts to wait 60 days before we can look into removing the restriction. Once your account has reached 60 days of stable use, please do reach back out to us so we can look into this for you.

Hope that helps! Regards, Alex

Hello there,

You can send an email to https://mail-tester.com

Their tool will show how you can improve your mail score (outgoing mail delivery).

You can also use a third party mail provider like SendGrid in order to avoid issues like this one. I’ll also recommend checking this article:

https://www.digitalocean.com/community/tutorials/why-you-may-not-want-to-run-your-own-mail-server

Hope that this helps!