IP address is in blocklists

An IP address may be added to email reputation lists if it was previously used to send spam or bulk messages. When flagged, email providers may reject or filter outgoing messages from that address.

These lists are managed by independent organizations. Gcore cannot remove IP addresses from third-party services and does not permit use of its services for distributing spam, chain letters, or unsolicited bulk email per clause 6.4 of the User Agreement and the Acceptable Use Policy. If delivery is affected, ordering an additional IP may help.

Reduce the risk

Best practices for sending email from a Gcore server:

• Send mail only to recipients who opted in.
• Include an unsubscribe link in every email.
• Configure SPF, DKIM, and PTR records correctly.

Check if the IP is flagged

MXToolbox checks a mail server IP against multiple email reputation databases.

1. Run a check on MXToolbox

   Go to MXToolbox and enter the server IP address in the Server IP or Domain field, then click Blacklist Check.

   

   The tool checks the IP against multiple services and shows a LISTED or OK status for each.

2. Open the listing details

   For each LISTED entry, click Detail to see the reason and removal instructions.

   
3. Request removal

   Follow the removal instructions provided by the operator. Most services require submitting a request through a web form or email.

   
4. Wait for a response

   Re-run the check periodically until the IP is no longer listed.