Problem encountered#

You cannot or no longer can send emails from your VPS or dedicated server, port 25 on your server appears to be blocked.

Cause#

If your IP gets blacklisted, port 25 on your server may be temporarily restricted. This is essential to prevent PulseHeberg's blocks, or even its entire network, from being blacklisted for SPAM.

Solution#

You have just acquired your VPS and port 25 has never worked#

We invite you to contact our technical support to have your port 25 unblocked. This request is processed within the day.

Identify the source of the SPAM coming from your server#

Several causes can lead to SPAM being sent from your server:

  • A malicious script on your server is using it to send unwanted emails. We recommend using an anti-malware tool to scan your server, such as ClamAV or Maldet. We also invite you to follow our documentation in case of a compromised server.
  • One of the email mailboxes hosted on your server is compromised and is being used to send SPAM. We recommend checking your outgoing email logs as well as your email queue. If necessary, change the password of all your mailboxes.

Ask support to unblock port 25#

Once the issue is resolved, we invite you to contact our technical support to have your port 25 unblocked. This request is processed within the day.