Skip to content
  • Solutions
    By Role
    • For Developers
    • For Content Managers
    • For Agencies
    • For IT Admins
    • For Web Hosters
    • For Developers
    • For Content Managers
    • For Agencies
    • For IT Admins
    • For Web Hosters
    By Infrastructure
    • Overview
    • AWS
    • Microsoft Azure
    • Alibaba Cloud
    • Google Cloud Platform
    • Vultr
    • Overview
    • AWS
    • Microsoft Azure
    • Alibaba Cloud
    • Google Cloud Platform
    • Vultr
    • Digital Ocean
    • Linode
    • Upcloud
    • Oracle
    • OVH
    • Digital Ocean
    • Linode
    • Upcloud
    • Oracle
    • OVH
  • Product
    • Plesk Features
    • Plesk Editions
    • What’s new
    • Pricing
    • Roadmap
    • Lifecycle Policy
    • Extensions Catalogue
  • Pricing
  • Extensions
    Featured Extensions
    • SocialBee
    • WP Toolkit
    • Sitejet Builder for Plesk
    • SEO Toolkit
    • Joomla! Toolkit
    • Premium Email
    • Email Security
    • SocialBee
    • WP Toolkit
    • Sitejet Builder for Plesk
    • SEO Toolkit
    • Joomla! Toolkit
    • Premium Email
    • Email Security
    Bundles and packs:
    • Business and Collaboration Edition
    • WP pack
    • Hosting pack
    • Power pack
    • Language pack
    • Business and Collaboration Edition
    • WP pack
    • Hosting pack
    • Power pack
    • Language pack

    See all Extensions

  • For Partners
    • Plesk Contributor Program
    • Plesk Partner Program
    • Affiliate program
    • Plesk University
  • Help Center
    • Documentation
    • Professional Services
    • Support
    • Contact Us
    • Wiki
    • Forum
  • Plesk 360 login
  • Free Trial
  • Pricing
  • Solutions
    • By Role
      • For Developers
      • For Content Managers
      • For Agencies
      • For IT Admins
      • For Web Hosters
    • By Infrastructure
      • Overview
      • Plesk on Amazon Web Services (AWS & Lightsail)
      • Microsoft Azure
      • Alibaba Cloud
      • Google Cloud Platform
      • Vultr
      • DigitalOcean
      • Linode
      • UpCloud
      • Oracle
      • OVH
  • Products
  • Pricing
  • Extensions
    • Featured Extensions
      • SocialBee
      • WP Toolkit
      • Sitejet Builder for Plesk
      • SEO Toolkit
      • Joomla! Toolkit
      • Premium Email
      • Email Security
    • Bundles and packs:
      • Business and Collaboration Edition
      • WP pack
      • Hosting pack
      • Power pack
      • Language pack
      • See all Extensions
  • For Partners
    • Plesk Contributor Program
    • Plesk Partner Program
    • Affiliate Program
    • Plesk University
  • Help Center
    • Documentation
    • Professional Services
    • Support
    • Contact Us
    • Wiki
    • Forum
  • Plesk 360 login
  • Free Trial
  • Pricing
  • Solutions
    • By Role
      • For Developers
      • For Content Managers
      • For Agencies
      • For IT Admins
      • For Web Hosters
    • By Infrastructure
      • Overview
      • Plesk on Amazon Web Services (AWS & Lightsail)
      • Microsoft Azure
      • Alibaba Cloud
      • Google Cloud Platform
      • Vultr
      • DigitalOcean
      • Linode
      • UpCloud
      • Oracle
      • OVH
  • Products
  • Pricing
  • Extensions
    • Featured Extensions
      • SocialBee
      • WP Toolkit
      • Sitejet Builder for Plesk
      • SEO Toolkit
      • Joomla! Toolkit
      • Premium Email
      • Email Security
    • Bundles and packs:
      • Business and Collaboration Edition
      • WP pack
      • Hosting pack
      • Power pack
      • Language pack
      • See all Extensions
  • For Partners
    • Plesk Contributor Program
    • Plesk Partner Program
    • Affiliate Program
    • Plesk University
  • Help Center
    • Documentation
    • Professional Services
    • Support
    • Contact Us
    • Wiki
    • Forum
  • Plesk 360 login
  • Free Trial
Plesk 360 login
Free Trial

Knowledge Base

Email header analysis reports SPF failed for localhost IP on mail sent from Plesk hosted mailbox: SPF Authentication : SPF Failed for IP – 127.0.0.1

 
emailemail securityhostedipmail

Symptoms

  • Analyzing an email header sent from plesk with MXToolbox or similar shown the following error on the report:

    SPF Authentication : SPF Failed for IP - 127.0.0.1

  • The email was sent from Plesk using webmail.

  • Full header does show the Plesk Server IP on the first Received: from line:

    Received: from plesk-hostname.example.com(unknown [203.0.113.2])

  • Same header reports a correct SPF result ofpass:

    Authentication-Results server.hostname.plesk; spf=pass (sender IP is 127.0.0.1) [email protected] smtp.helo=plesk-hostname.example.com
    Received-SPF pass (plesk-hostname.example.com: localhost is always allowed.) client-ip=127.0.0.1; [email protected]; helo=plesk-hostname.example.com;

Cause

This is expected for emails sent from the webmail, 127.0.0.1 is added to the email headers. While sending email from email client will show the client IP instead. Additionally, if Plesk Email Security is installed, Amavis service may add the localhost when it scans the email passed from Postfix.

Resolution

The SPF result is pass so no actions are required. localhost IP failed message can be safely ignored.

Tweet
Share
Share
Email
0 Shares
Read the full article
Related Posts

Full Site Check now scans for Google Fonts

Read More »

Server Management: IP Mapping Guideline

Read More »

Podcast | Self-Hosted vs. Hosted eCommerce Sites

Read More »
Knowledge Base

Unable to send mail from Plesk server: deferred (delivery temporarily suspended: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)

Read More »

Mail delivery does not work: do not list domain in BOTH mydestination and virtual_mailbox_domains

Read More »

Unable to issue a Let’s Encrypt certificate for a domain or its mail in Plesk: the DNS challenge used another IP address

Read More »

Can’t access mail: Warning: Inotify instance limit for user exceeded

Read More »

Hosting Wiki

  • Content Security Policy ( CSP )
  • Server Redundancy
  • QMAIL
  • Sendmail
  • Postfix
  • Bare Metal Server
  • Oracle VM Server
  • Server Virtualization Software
  • Windows Server
  • Linux
  • JavaScript
  • Plesk
  • Web Server
  • DNS Server
  • IPv6
  • IPv4
  • SIP
  • UDP/IP
  • Email Autoresponder
  • Mailing Lists
  • Email Alias
  • Email Virus Protection
  • Email Forwarding
  • Webmail
  • SPF Record
  • TCP/IP
  • SMTP
X-twitter Linkedin Youtube Reddit Github
  • Product
  • Login
  • Pricing
  • Editions
  • For Partners
  • Partner Program
  • Contributor Program
  • Affiliate Program
  • Plesk University
  • Company
  • Blog
  • Careers
  • Events
  • About Plesk
  • Our Brand
  • Resources
  • User and Admin guides
  • Help Center
  • Migrate to Plesk
  • Contact Us
  • Hosting Wiki
  • Forum
  • Legal
  • Legal
  • Privacy Policy
  • Imprint

© 2025 WebPros International GmbH

Part of the WebPros®  Family