---
title: "How To Configure SMTP2go SPF For Better Email Authentication | AutoSPF"
description: "Learn how to configure SMTP2Go SPF correctly to improve email authentication, prevent spoofing, and boost email deliverability with this step-by-step guide."
image: "https://autospf.com/og/blog/how-to-configure-smtp2go-spf-for-better-email-authentication.png"
canonical: "https://autospf.com/blog/how-to-configure-smtp2go-spf-for-better-email-authentication/"
---

Quick Answer

Learn how to configure the SMTP2GO SPF record to authorize your mail servers, improve email authentication, and reduce spoofing. A correctly configured SPF record helps increase email deliverability and prevents messages from being marked as spam.

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![Configure SMTP2go](https://media.mailhop.org/autospf/spf-checker-0030-1784876907922.jpg) 

SPF, short for Sender Policy Framework, is an email authentication method that allows a domain owner to specify which mail server, email server, cloud email provider, or authorized third-party service is allowed to send email on **behalf of a sender domain**. In practical terms, an SPF record is published in DNS as a [TXT record](https://www.digicert.com/faq/dns/what-is-a-txt-record), and recipient systems such as Gmail, Yahoo, Microsoft, and Google Workspace use it to evaluate whether outgoing emails are legitimate.

_When a recipient server receives a message, it checks the envelope sender, often associated with the Return-Path or return-path address, against the sending IP address_. If the sending IP address is listed in the domains [SPF record](https://autospf.com/blog/spf-records-in-dns-a-complete-guide-for-email-security/), the message can produce an SPF pass. If not, the result may be an SPF fail, SPF softfail, SPF neutral, or even a permerror if the SPF configuration is malformed.

The purpose of Sender Policy Framework is to reduce email spoofing, phishing attacks, and unauthorized use of your domain. Without an SPF record, attackers can more easily impersonate your brand, send fraudulent messages, and damage your domain reputation. This matters because poor domain reputation can lead to reduced email deliverability, increased spam filtering, and legitimate emails being routed to the spam/junk folder or, in some cases, the Gmail Promotions Tab. Implementing [email security](https://autospf.com/) best practices helps keep your inbox safe from evolving threats.

## How SPF results influence filtering

SPF alone does not guarantee inbox placement, but it is a foundational layer of email authentication and **domain-based security**. A valid SPF record tells recipient systems that your domain has defined its authorized sending servers. This helps with spoofing prevention, supports [policy enforcement](https://www.f5.com/glossary/policy-enforcement) under DMARC, and improves trust signals for recipient filters.

SPF also works alongside DKIM and DMARC. DKIM, or DomainKeys Identified Mail, uses a private key to create a digital signature and a public key published in DNS to enable signature verification. DMARC, or Domain-based Message Authentication Reporting and Conformance, then evaluates SPF and DKIM alignment against the visible From domain. _A strong DMARC policy depends on reliable SPF, DKIM, and sender alignment_.

## How SMTP2GO Uses SPF to Help Verify Sending Domains

SMTP2GO is a cloud email provider that sends outgoing emails through its infrastructure while helping customers maintain proper [email authentication](https://autospf.com/blog/spf-record-explained-understanding-email-authentication-for-your-domain/). When you send through SMTP2GO, your domain needs to show that SMTP2GO is authorized to send on its behalf. This is where the SPF record, DKIM, DMARC, and SMTP2GO domain verification process become important.

_Inside the SMTP2GO dashboard, domains are usually managed under Verified Senders_. The Verified Senders area helps confirm that you own or control the sender domain and provides the DNS values required for domain verification. Depending on your setup, SMTP2GO may ask you to add a TXT record for SPF, a CNAME record for DKIM, or other DNS records used for **domain authentication**.

SMTP2GO may also use a custom return-path address to support tracking, bounce processing, and authentication alignment. In some configurations, this can involve a subdomain dedicated to bounce handling. The [return-path](https://www.mailjet.com/blog/deliverability/return-path-customization-explained/) address is important because SPF evaluates the domain used in the envelope sender, not always the same address visible to the end user in the email client.

![Spf Record Office 365 0994](https://media.mailhop.org/autospf/spf-record-office-365-0994-1784876934383.jpg)

## SPF, DKIM, and DMARC work together

For best results, SMTP2GO should not be configured with SPF alone. SPF validates the sending source, DKIM validates message integrity through a [DKIM signature](https://docs.mapp.com/docs/dkim-signature), and DMARC connects authentication results to the **visible sender domain**. This layered approach reduces email spoofing, helps block phishing attacks, and improves email deliverability.

A typical SMTP2GO authentication setup may include:

- An SPF record published as a TXT record
- A CNAME record for DKIM or CNAME-based authentication
- A DMARC TXT record for reporting and policy enforcement
- A verified sender domain in Verified Senders
- A configured **return-path address** for bounce handling

This combination gives recipient systems stronger evidence that messages are legitimate and not part of email spoofing or phishing attacks.

## Prerequisites Before Configuring SMTP2GO SPF

_Before editing DNS, confirm that you have access to your domains DNS settings through your registrar or DNS host_. Common providers include Cloudflare, GoDaddy, Namecheap, and [Amazon Route 53](https://en.wikipedia.org/wiki/Amazon%5FRoute%5F53). If your organization uses Google Workspace, Microsoft 365, SMTP2GO, smtpcorp.com, an Email-to-fax service, an Email-to-SMS service, a CRM, or a mailing list platform, you must account for each authorized third-party service in the same SPF record.

SPF allows only one SPF TXT record per domain. Publishing [multiple SPF records](https://autospf.com/blog/multiple-spf-records-essential-configuration-for-email-authentication/) can cause a permerror, which may result in SPF fail behavior at the recipient server. Instead, **all approved senders** must be consolidated into one SPF record using mechanisms such as include, ip4, ip6, and mx.

![Kitterman Spf 0338](https://media.mailhop.org/autospf/kitterman-spf-0338-1784876983086.jpg)

### Access and audit checklist

Before you configure SMTP2GO SPF, gather the following:

- Access to DNS for the sender domain or subdomain
- Access to the SMTP2GO dashboard at smtp2go.com
- The domain listed under Verified Senders
- Existing SPF record values, if any
- Current DKIM and DMARC records
- A list of all authorized sending servers
- Any authorized IP address used by your own [mail server](https://www.techtarget.com/whatis/definition/mail-server-mail-transfer-transport-agent-MTA-mail-router-Internet-mailer)
- Knowledge of **whether you use VERP**, or Variable Envelope Return-Path, for bounce handling
- Testing tools such as MXToolbox, mail-tester, About My Email, dmarcian, DMARCLY, or PowerDMARC

Also review current Gmail and Yahoo requirements. Gmail and Yahoo now expect bulk senders to use proper SPF, DKIM, and DMARC. If your SMTP2GO [domain verification](https://workos.com/guide/the-developers-guide-to-domain-verification) is incomplete, or if your SPF record does not authorize SMTP2GO, email deliverability can suffer.

## Finding the Correct SMTP2GO SPF Record for Your Domain

To find the correct SMTP2GO SPF record, sign in to SMTP2GO and open the Verified Senders section. Select the domain you want to authenticate. SMTP2GO will display the required DNS values for domain verification, including the SPF record or TXT record value you need to publish.

A common SPF format uses the include mechanism, such as:

`v=spf1 include:*spf*.*smtp2go*.com ~all`

_This tells recipient systems that SMTP2GO is included among your authorized sending servers_. The \~all ending represents a soft fail, meaning **non-authorized sources** should be treated with suspicion but not necessarily rejected. Some organizations eventually move to -all, a hard fail, after confirming that every legitimate email server and cloud email provider is included.

If you already have an SPF record, do not create another one. Instead, merge SMTP2GO into the existing TXT record. For example, if you use Google Workspace and SMTP2GO, your SPF record may resemble:

`v=spf1 include:_spf.*google*.com include:*spf*.*smtp2go*.com ~all`

Always check the current guidance in SMTP2GO because SPF configuration details may change. If unsure, contact the SMTP2GO Support Team or Customer Support before modifying production DNS.

![Spf Record Checker 0991](https://media.mailhop.org/autospf/spf-record-checker-0991-1784877334126.jpg)

### When SMTP2GO provides CNAME-based authentication

SMTP2GO often uses CNAME record values for DKIM and related domain verification steps. A CNAME record is different from a TXT record: a TXT record stores text such as an SPF record or **DMARC policy**, while a [CNAME record](https://www.ibm.com/think/topics/cname) points one DNS hostname to another.

For DKIM, a CNAME record may delegate the DKIM [public key](https://www.techtarget.com/searchsecurity/definition/public-key) lookup to SMTP2GO, allowing SMTP2GO to manage key rotation and signing infrastructure. This is useful because DKIM relies on a public key in DNS and a private key held securely by the sending provider. The DKIM signature is added to email headers, and the recipient server performs signature verification.

_Do not confuse the SPF record with the CNAME record used for DKIM. SPF is typically a TXT record_. DKIM may use a TXT record or a CNAME record, depending on the provider. SMTP2GOs Verified Senders page will show the exact records required for domain verification.

![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?

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[ 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/)

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