{"id":22987,"date":"2025-07-15T04:55:49","date_gmt":"2025-07-15T04:55:49","guid":{"rendered":"https:\/\/smartreach.io\/blog\/?p=22987"},"modified":"2025-07-15T04:55:50","modified_gmt":"2025-07-15T04:55:50","slug":"how-to-set-up-email-headers-correctly","status":"publish","type":"post","link":"https:\/\/smartreach.io\/blog\/how-to-set-up-email-headers-correctly\/","title":{"rendered":"How to Set Up Email Headers for Better Deliverability?"},"content":{"rendered":"\n
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Cold emails often go unanswered, not because of poor messaging, but because they never reach the inbox.<\/p>\n\n\n\n

In one case, our SDR team saw response rates drop from 8% to 2% overnight. <\/p>\n\n\n\n

After ruling out copy and targeting issues, we traced the problem to an email domain setting update. <\/p>\n\n\n\n

The email authentication headers hadn\u2019t been reconfigured. Once fixed, deliverability rebounded within 48 hours.<\/p>\n\n\n\n

Email headers act as authentication checkpoints. When properly set up, they help ensure emails land in inboxes, not spam folders. <\/p>\n\n\n\n

Misconfigurations, on the other hand, silently block outreach efforts and stall pipeline growth.<\/p>\n\n\n\n

In this blog, we will check how to set the email headers properly. <\/p>\n\n\n\n

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What are email headers, and why do they impact deliverability?<\/h2>\n\n\n\n

Email headers are technical elements attached to every email that help verify the sender\u2019s identity. <\/p>\n\n\n\n

When email headers like SPF, DKIM, and DMARC are misconfigured or missing, email providers may block or filter your outreach, even if the content is solid. In some cases, deliverability can drop from 90% to 20%, meaning most prospects never see your email.<\/p>\n\n\n\n

These authentication protocols work together to signal that your email is safe and trustworthy. Proper configuration improves inbox placement and boosts response rates.<\/p>\n\n\n\n

\ud83d\udc49 Read the full guide on how email headers affect deliverability<\/a><\/p>\n\n\n\n

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Key email headers that impact deliverability<\/h2>\n\n\n\n

Sales teams must get these six headers right to ensure cold emails land in inboxes:<\/p>\n\n\n\n

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  • SPF<\/strong>: Verifies which IPs are allowed to send emails from your domain. Without it, your emails look suspicious, especially to industries with strict security like finance and manufacturing.
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  • DKIM<\/strong>: Adds a digital signature to confirm the email wasn\u2019t tampered with. Missing DKIM = higher chances of being flagged as spam.
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  • DMARC<\/strong>: Tells providers how to handle failed SPF or DKIM checks (deliver, quarantine, or reject). Without it, you lose control over how your emails are treated.
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  • Return-Path<\/strong>: Directs bounced emails. Mismatches can hurt your sender reputation and trigger spam filters.
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  • Reply-To<\/strong>: Should align with your domain’s authentication. Mismatches can confuse both mail servers and prospects.
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  • Message-ID<\/strong>: Each email must have a unique ID. Duplicates can trigger spam detection, especially in large-scale outreach.<\/li>\n<\/ul>\n\n\n\n

    Even one misconfigured header can tank your campaign. Get these right to protect your deliverability.<\/p>\n\n\n\n

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    How to check if your email headers are correctly configured?<\/h2>\n\n\n\n

    Even the best email copy won\u2019t work if your headers are misconfigured. <\/p>\n\n\n\n

    Here’s a simple 5-step process to verify if your email headers are set up correctly and ensure your cold emails are reaching inboxes:<\/p>\n\n\n\n

    Step #1: Send a test email<\/h3>\n\n\n\n

    Start by sending an email from your outreach tool to a personal Gmail or Outlook account. <\/p>\n\n\n\n

    This helps you review how your emails appear on the receiving end, just like a prospect would see them.<\/p>\n\n\n\n

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