---
title: "How To Set Up SPF Authentication For Mailhostbox And Endurance International Emails | AutoSPF"
description: "Learn how to set up SPF authentication for Mailhostbox and Endurance International emails to improve deliverability and prevent email spoofing."
image: "https://autospf.com/og/blog/how-to-set-up-spf-authentication-for-mailhostbox-and-endurance-international-emails.png"
canonical: "https://autospf.com/blog/how-to-set-up-spf-authentication-for-mailhostbox-and-endurance-international-emails/"
---

Quick Answer

To set up SPF authentication for Mailhostbox and Endurance International emails, add the correct SPF TXT record to your domain’s DNS, include all authorized mail servers, and verify the record to improve email delivery and prevent spoofing.

Share 

[ ](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fautospf.com%2Fblog%2Fhow-to-set-up-spf-authentication-for-mailhostbox-and-endurance-international-emails%2F "Share on LinkedIn") [ ](https://twitter.com/intent/tweet?text=How%20To%20Set%20Up%20SPF%20Authentication%20For%20Mailhostbox%20And%20Endurance%20International%20Emails&url=https%3A%2F%2Fautospf.com%2Fblog%2Fhow-to-set-up-spf-authentication-for-mailhostbox-and-endurance-international-emails%2F "Share on X/Twitter") [ ](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fautospf.com%2Fblog%2Fhow-to-set-up-spf-authentication-for-mailhostbox-and-endurance-international-emails%2F "Share on Facebook") [ ](https://reddit.com/submit?url=https%3A%2F%2Fautospf.com%2Fblog%2Fhow-to-set-up-spf-authentication-for-mailhostbox-and-endurance-international-emails%2F&title=How%20To%20Set%20Up%20SPF%20Authentication%20For%20Mailhostbox%20And%20Endurance%20International%20Emails "Share on Reddit") [ ](mailto:?subject=How%20To%20Set%20Up%20SPF%20Authentication%20For%20Mailhostbox%20And%20Endurance%20International%20Emails&body=Check out this article: https%3A%2F%2Fautospf.com%2Fblog%2Fhow-to-set-up-spf-authentication-for-mailhostbox-and-endurance-international-emails%2F "Share via Email") 

![Set Up SPF Authentication](https://media.mailhop.org/autospf/multiple-spf-records-7541-1780475568425.jpg) 

Sender Policy Framework (SPF) authentication plays a central role in [email security](https://autospf.com/) and deliverability for organizations using mailhostbox, business email, and enterprise email solutions. SPF is a **DNS-based standard** designed to prevent phishing, email spoofing, and spam by allowing domain owners to specify which servers are permitted to send emails on their behalf.

Without **SPF authentication**, your outgoing messages”whether sent via webmail, a desktop email client, or a mobile email client”are much more likely to be flagged as spam or rejected by receiving [email servers](https://www.axigen.com/articles/what-is-an-email-server%5F107.html), impacting your organization’s communication reliability. With business email continuity and zero data loss policies at stake, robust SPF records are critical.

When SPF is not in place or incorrectly configured in your domains DNS settings, unauthorized users can send [malicious emails](https://www.cybersecuritydive.com/news/email-phishing-trends-microsoft-qr-codes/819077/) as though they’re from your domain. This can lead to compromised passwords, [phishing attacks](https://www.trendmicro.com/en%5Fus/what-is/phishing/types-of-phishing.html), and blacklisting of your domain, despite protections like **anti-virus technology** and virus protection embedded in your mail infrastructure. For enterprises, where 100% uptime and fail-safe backup systems such as NetApp are essential, SPF configuration deserves careful attention.

## **Overview of Mailhostbox and Endurance International Email Sending Infrastructure**

Before making any DNS configuration changes, it’s important to understand the specific **email server infrastructure** used by Mailhostbox and Endurance International. These cloud email service providers offer feature-rich solutions, such as business email and enterprise email with robust mail storage options (typically ranging from 5GB storage for Free Email to 30GB accounts for Business Email). Whether using a mobile email client on an Apple iPhone or Android device, webmail mailhostbox, or desktop apps like Microsoft Outlook or Thunderbird, all outgoing mail from your domain will ultimately be routed through the providers outbound [server infrastructure](https://www.solarwinds.com/resources/it-glossary/server-infrastructure).

For Mailhostbox, sending mail typically relies on SMTP services available through hostname configurations like:

- `smtp.*mailhostbox*.com`
- `us2.smtp.*mailhostbox*.com`
- `us3.smtp.*mailhostbox*.com`

Incoming messages use [IMAP](https://www.techtarget.com/whatis/definition/IMAP-Internet-Message-Access-Protocol) or POP services (imap._mailhostbox_.com, pop._mailhostbox_.com) for flexible email client settings whether you’re managing emails from the Gmail application, Windows Mail App on MacOS, or older platforms like Outlook Express, Eudora, or Entourage 2004.

The providers enterprise-level infrastructure supports strong email security using SSL or STARTTLS for encrypted transmissions, anti-spam policy enforcement, and efficient virus protection. The architecture supports cloud-based backup, tasks, contact group management, file sharing, synced accounts, distribution lists, and auto-responder capabilities that underpin modern business demands.

![Kitterman Spf 4563](https://media.mailhop.org/autospf/kitterman-spf-4563-1780479334483.jpg)

## **Identifying Your Domains Current SPF Record Before Making Changes**

Before you add or update your SPF record to account for Mailhostbox or **Endurance International**, identify any pre-existing [SPF records](https://autospf.com/blog/spf-records-benefits-uses-and-generation/). An improperly merged record or duplicate entry can break email deliverability across all mail and webmail systems, including those accessed via mobile email clients or desktop email client configurations.

### How to Check Your SPF Record

#### Using Online Tools

Utilize online [DNS lookup](https://www.digicert.com/faq/dns/how-does-dns-lookup-work) services such as MXToolbox or DNSstuff. Enter your domain (e.g., yourdomain.com) and review the TXT records. Look for a line similar to:

`v=spf1 include:spf.protection.domain.com -all`

#### Using Command Line

If you manage or have access to the domain via a terminal or **command prompt**, run:

`nslookup -type=txt yourdomain.com`

If you already use multiple email hosting solutions (Free Email, Business Email, or Enterprise Email hosting), its common to see multiple include mechanisms referencing other third-party mail providers.

### Interpreting Results

Take note if your current SPF record contains references to prior email providers. Be careful not to remove necessary includes related to services such as [Google Workspace](https://en.wikipedia.org/wiki/Google%5FWorkspace), Microsoft 365, or any custom outbound server your enterprise email may use. A misstep can inadvertently cut off legitimate email flow for calendar import/export, mailing lists, and contact group notifications.

## **Finding the Correct SPF Include Mechanisms for Mailhostbox and Endurance International**

To validate mail sent via the Mailhostbox SMTP servers, your SPF record must reference their **authorized sending hosts**. Using incorrect hostnames or omitting required mechanisms will lead to delivery failures for all email account traffic, whether sent via desktop email client, mobile email client, or through the provider’s webmail interface.

![Spf Record Checker 5236](https://media.mailhop.org/autospf/spf-record-checker-5236-1780479361728.jpg)

### Official SPF Include Mechanism from Mailhostbox

The recommended SPF include for Mailhostbox is:

`include:spf.*mailhostbox*.com`

This mechanism allows all [IP addresses](https://www.fortinet.com/resources/cyberglossary/what-is-ip-address) authorized by Mailhostboxs infrastructure (including `smtp.*mailhostbox*.com`, `us2.smtp.*mailhostbox*.com`, and `us3.smtp.*mailhostbox*.com`) to send mail for your domain.

### Endurance International SPF Mechanisms

Endurance International generally leverages the Mailhostbox infrastructure for its business email accounts, but if directed otherwise, consult their provider-specific documentation (e.g., support.mailhostbox.com or emailhostbox.com for Emailhostbox). Most domains managed under the Endurance International group benefit from the same SPF mechanism.

![Spf Record Syntax 6633](https://media.mailhop.org/autospf/spf-record-syntax-6633-1780479391658.jpg)

#### Important: Account-Specific Instructions

If your custom branding configuration includes white-labelled URLs or email servers, confirm the correct include by referencing your welcome email, your Email Admin Dashboard, or direct support. Some legacy accounts may require different SPF hostnames.

## **Creating an SPF Record for Domains Sending Only Through Mailhostbox**

If your domain uses Mailhostbox exclusively for all **outbound email**”whether through business email, enterprise email, or Free Email accounts”its best to design an SPF record that is concise and specific to their infrastructure.

### Constructing the Record

Your DNS TXT entry should resemble the following:

`v=spf1 include:spf.*mailhostbox*.com -all`

This statement:

- `v=spf1` designates this as an SPF record.
- `include:spf.*mailhostbox*.com` authorizes all outbound servers from Mailhostbox, including SMTP relays secured with SSL or [STARTTLS](https://www.paubox.com/blog/what-is-starttls).
- \-all means only **servers listed** (no others) are allowed to send mail from your domain, improving email security and aligning with anti-spam policy guidelines.

![Spf Validator 5200](https://media.mailhop.org/autospf/spf-validator-5200-1780481714399.jpg)

### Where to Add the Record

#### DNS Dashboard Access

Navigate to wherever your DNS zone is managed. This could be:

- The Email Admin Dashboard under your Mailhostbox or Emailhostbox portal
- Your domain registrars [DNS management](https://www.cloudns.net/blog/what-is-dns-management-how-to-use-cloudns-control-panel/) interface (GoDaddy, Namecheap, etc.)
- Enterprise DNS solutions like Route 53 or Cloudflare

Create (or update) a TXT record for your domains root (@):

- **Name/Host/Alias:** `@` or blank (as per provider instructions)
- **Value**: `v=spf1 include:spf.*mailhostbox*.com -all`
- **TTL**: Leave default (usually 3600 seconds / 1 hour)

### Tips for Ongoing Management

- If you deploy desktop email clients (Microsoft Outlook, Thunderbird, Windows Mail App) or mobile email clients (Android email setup, iOS email setup on Apple iPhone, Gmail application), SPF authentication is invisible to end users but vital for backend email delivery.
- After updates, validate the record using online tools to **confirm propagation**. SPF changes might take minutes to several hours depending on DNS TTL.
- If you run secondary mail services (e.g., bulk mailing lists, backup notification systems), append additional mechanisms or includes as required”never create [multiple SPF records](https://autospf.com/blog/multiple-spf-records-essential-configuration-for-email-authentication/); instead, combine mechanisms within a single record.
- For documentation and troubleshooting, refer to support.mailhostbox.com or consult with your DNS administrator.

Correct and timely SPF implementation ensures your business email or enterprise email achieves high deliverability, reduces spam, and strengthens overall email security, benefiting all users across platforms including webmail, desktop, and mobile environments.

![Brad Slavin](https://media.mailhop.org/autospf/images/authors/brad-slavin.jpg) 

[ Brad Slavin ](/authors/brad-slavin/) 

General Manager

Founder and General Manager of DuoCircle. Product strategy and commercial lead for AutoSPF's 2,000+ customer base.

[LinkedIn Profile →](https://www.linkedin.com/in/bradslavin) 

## Ready to get started?

Try AutoSPF free — no credit card required.

[ Book a Demo ](/book-a-demo/) 

## Related Articles

[  Intermediate 6m  10 Reasons Why DIY-ing SPF isn’t a Good Choice for Companies  Apr 4, 2024 ](/blog/10-reasons-diy-ing-spf-isnt-good-choice-for-companies/)[  Intermediate 5m  The 12.4 billion shield for your email communications: Why DMARC software is the unsung hero in the war against phishing actors!  Nov 19, 2025 ](/blog/12-4-billion-dmarc-software-shield-protecting-email-from-phishing-actors/)[  Intermediate 3m  3 points to consider before setting your SPF record to -all (HardFail)  May 22, 2025 ](/blog/3-points-to-consider-before-setting-your-spf-record-hardfail/)[  Intermediate 3m  5 key contributors to the development of the Sender Policy Framework  Nov 12, 2024 ](/blog/5-key-contributors-to-sender-policy-framework-development/)

```json
{"@context":"https://schema.org","@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com","logo":{"@type":"ImageObject","url":"https://autospf.com/images/autospf-logo.png"},"description":"Automatic SPF flattening and email authentication management. Resolve SPF lookup limits, flatten SPF records, and maintain email deliverability across all your domains.","parentOrganization":{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138883901","name":"DuoCircle LLC","url":"https://www.duocircle.com","sameAs":["https://www.wikidata.org/wiki/Q138883901","https://www.crunchbase.com/organization/duocircle-llc","https://www.linkedin.com/company/duocircle","https://github.com/duocircle"],"subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}]},"sameAs":["https://www.wikidata.org/wiki/Q138897474","https://www.linkedin.com/company/autospf","https://x.com/autospf01","https://www.g2.com/products/autospf/reviews"],"contactPoint":{"@type":"ContactPoint","contactType":"customer support","url":"https://autospf.com/contact-us/"},"knowsAbout":["SPF Record Flattening","Sender Policy Framework","Email Authentication","DNS Management","DMARC","DKIM"]}
```

```json
{"@context":"https://schema.org","@type":"WebSite","name":"AutoSPF","url":"https://autospf.com","description":"Automatic SPF flattening and email authentication management. Resolve SPF lookup limits, flatten SPF records, and maintain email deliverability across all your domains.","publisher":{"@type":"Organization","name":"AutoSPF","url":"https://autospf.com","logo":{"@type":"ImageObject","url":"https://autospf.com/images/autospf-logo.png"},"description":"Automatic SPF flattening and email authentication management. Resolve SPF lookup limits, flatten SPF records, and maintain email deliverability across all your domains.","parentOrganization":{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138883901","name":"DuoCircle LLC","url":"https://www.duocircle.com","sameAs":["https://www.wikidata.org/wiki/Q138883901","https://www.crunchbase.com/organization/duocircle-llc","https://www.linkedin.com/company/duocircle","https://github.com/duocircle"],"subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}]}}}
```

```json
{"@context":"https://schema.org","@type":"BlogPosting","headline":"How To Set Up SPF Authentication For Mailhostbox And Endurance International Emails","description":"Learn how to set up SPF authentication for Mailhostbox and Endurance International emails to improve deliverability and prevent email spoofing.","url":"https://autospf.com/blog/how-to-set-up-spf-authentication-for-mailhostbox-and-endurance-international-emails/","datePublished":"2026-06-03T00:00:00.000Z","dateModified":"2026-06-03T00:00:00.000Z","dateCreated":"2026-06-03T00:00:00.000Z","author":{"@type":"Person","@id":"https://autospf.com/authors/brad-slavin/#person","name":"Brad Slavin","url":"https://autospf.com/authors/brad-slavin/","jobTitle":"General Manager","description":"Brad Slavin is the founder and General Manager of DuoCircle, the company behind AutoSPF, DMARC Report, Phish Protection, and Mailhop. He founded DuoCircle in 2014 to solve the SPF 10-DNS-lookup problem at scale and has led the company's growth to 2,000+ customers. Brad's focus is product strategy, customer relationships, and the commercial and compliance side of email authentication (DPAs, SLAs, enterprise procurement) rather than hands-on DNS engineering.","image":"https://media.mailhop.org/autospf/images/authors/brad-slavin.jpg","knowsAbout":["Email Security Strategy","SaaS Product Management","Enterprise Compliance","Customer Success","Email Deliverability Business"],"worksFor":{"@type":"Organization","name":"AutoSPF","url":"https://autospf.com"},"sameAs":["https://www.linkedin.com/in/bradslavin"]},"publisher":{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com","logo":{"@type":"ImageObject","url":"https://autospf.com/images/autospf-logo.png"},"description":"Automatic SPF flattening and email authentication management. Resolve SPF lookup limits, flatten SPF records, and maintain email deliverability across all your domains.","parentOrganization":{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138883901","name":"DuoCircle LLC","url":"https://www.duocircle.com","sameAs":["https://www.wikidata.org/wiki/Q138883901","https://www.crunchbase.com/organization/duocircle-llc","https://www.linkedin.com/company/duocircle","https://github.com/duocircle"],"subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}]},"sameAs":["https://www.wikidata.org/wiki/Q138897474","https://www.linkedin.com/company/autospf","https://x.com/autospf01","https://www.g2.com/products/autospf/reviews"],"contactPoint":{"@type":"ContactPoint","contactType":"customer support","url":"https://autospf.com/contact-us/"},"knowsAbout":["SPF Record Flattening","Sender Policy Framework","Email Authentication","DNS Management","DMARC","DKIM"]},"mainEntityOfPage":{"@type":"WebPage","@id":"https://autospf.com/blog/how-to-set-up-spf-authentication-for-mailhostbox-and-endurance-international-emails/"},"articleSection":"intermediate","keywords":"","image":{"@type":"ImageObject","url":"https://media.mailhop.org/autospf/multiple-spf-records-7541-1780475568425.jpg","caption":"Set Up SPF Authentication"},"speakable":{"@type":"SpeakableSpecification","cssSelector":[".answer-block","h1"]}}
```

```json
{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://autospf.com/"},{"@type":"ListItem","position":2,"name":"Blog","item":"https://autospf.com/blog/"},{"@type":"ListItem","position":3,"name":"Intermediate","item":"https://autospf.com/intermediate/"},{"@type":"ListItem","position":4,"name":"How To Set Up SPF Authentication For Mailhostbox And Endurance International Emails","item":"https://autospf.com/blog/how-to-set-up-spf-authentication-for-mailhostbox-and-endurance-international-emails/"}]}
```