Email Tools
Check SPF, DKIM, DMARC, blacklist status, and reverse DNS to improve email authentication and deliverability.
Email Deliverability Test
Test email delivery rates and check if emails are likely to reach the inbox.
What Are Email Authentication Tools?
Email authentication tools help you verify that your domain and mail servers are correctly configured for email security and email deliverability. They check DNS-based records that receiving servers use to validate senders and reduce spam and phishing. The main protocols are SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting & Conformance). Together they improve email reputation and provide email spam protection.
SPF lists which IPs and servers are allowed to send mail for your domain. DKIM adds a cryptographic signature to messages so receivers can confirm they weren’t altered. DMARC tells receivers what to do when SPF or DKIM fail (e.g. quarantine or reject) and can send you reports. Beyond authentication, DNS-based blacklists (DNSBL) list IPs or domains known for spam; an email blacklist checker shows if your IP is listed. Reverse DNS (PTR) and forward-confirmed reverse DNS (FCrDNS) help receivers verify that your mail server’s IP matches its hostname, which supports email deliverability.
Email Tools FAQ
What is email authentication?
Email authentication is the set of DNS and cryptographic methods that let receiving servers verify that messages are really from the claimed sender. SPF, DKIM, and DMARC are the main standards. They reduce spoofing, improve deliverability, and help protect your domain’s reputation.
How do SPF, DKIM, and DMARC work together?
SPF authorizes which servers can send for your domain. DKIM signs each message so receivers can check it wasn’t modified. DMARC uses both results and tells receivers what to do when checks fail (e.g. reject or quarantine) and can send you aggregate reports. Use all three for strong email authentication.
Why is my email going to spam?
Common causes include missing or misconfigured SPF, DKIM, or DMARC; your sending IP or domain on a blacklist; poor reverse DNS or FCrDNS; or content and engagement signals. Run an email reputation check and fix any failing authentication or blacklist issues first.
What is an email blacklist?
An email blacklist (DNSBL) is a list of IPs or domains that have been reported or detected for spam or abuse. Receiving servers may reject or filter mail from listed senders. Use an email blacklist checker to see if your IP or domain is listed and follow each list’s delisting process if needed.
How does reverse DNS affect deliverability?
Reverse DNS (PTR) maps your mail server’s IP to a hostname. Many receivers require a valid PTR and that the hostname resolves back to the same IP (FCrDNS). Missing or mismatched PTR can cause rejections or lower trust, so it’s important for deliverability.
How often should I check my email reputation?
Check after any change to DNS, mail infrastructure, or sending patterns. For ongoing monitoring, a monthly email reputation check is a good baseline; increase frequency if you’ve had deliverability issues or are ramping up volume.