Support » Fixing WordPress » SMTP server error 5.1.1 User unknown

  • Resolved rsanchez1123


    I’m having an odd problem with email that I could use some help debugging.

    I have a dev server and a live server for my wordpress site. The problem I’m having is that I’m trying to email a particular email address. The email gets sent just fine from my dev server, but it fails sending from my live server. My dev and live servers are on different domains, and the email address I’m trying to send has the same domain as my live server.

    On both servers, I have it set to use SMTP, and on the live server it is giving me this error:

    SMTP server error: 5.1.1 … User unknown

    The only SMTP options I have set from the Advance Email Options page are:

    SMTP Host: localhost
    SMTP Port: 25
    Encryption: No encryption.

    This definitely has me stumped. The live and dev servers are pretty much identical, except for the domain name. I think the domain name might be an issue, but I’m not sure. I’d appreciate any help with this.

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