Open Relay
An open mail relay is a Simple Mail Transfer Protocol (SMTP) server configured so that anyone on the internet can send email through it, not just mail destined to or originating from known users. Open relays are exploited by spammers and worms and blocklisted.
Back to GlossaryShare
Get in Touch
Talk to us
Do you want to remove your IP/domain from one of our blocklists?
Please use our lookup-service and follow the instructions there in order to get that resolved.