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  • Email Tools
      Smart Email Tools

      Extract, analyze and test your emails for content, authentication and deliverability.

      Extraction Tools
      • Extract HTML
      • Extract Text
      • Extract & Analyze Headers
      • Extract Attachments
      • Extract Links
      Analysis & Testing
      • SMTP Server Test
      • SpamAssassin Test
      • Email Authentication Check
      • Spam Words Checker
      • HTML Code Validator
      • Email Source Analyzer
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  • SuperTools
      Advanced DNS, Network & Security Tools

      Deep-dive into DNS, IP, TLS and security records for any domain or IP.

      DNS Records
      • DNS Lookup
      • AAAA Lookup
      • MX Lookup
      • NS Lookup
      • CNAME Lookup
      • TXT Lookup
      • SOA Lookup
      • SRV Lookup
      Email Auth
      • SPF Lookup
      • SPF Authorization
      • DKIM Lookup
      • DMARC Lookup
      • BIMI Lookup
      • MTA-STS Lookup
      Network Tools
      • Ping
      • Traceroute
      • HTTP Lookup
      • HTTPS Lookup
      • TCP Lookup
      • TLS Lookup
      Security & Cert
      • Certificate Chain
      • DNSKEY Lookup
      • DS Lookup
      • DNSSEC Lookup
      • RRSIG Lookup
      • NSEC3PARAM Lookup
      IP & Location
      • Reverse DNS
      • ARIN Lookup
      • ASN Lookup
      • LOC Lookup
      • IP2Location
      • What is My IP
      Domain Tools
      • Domain Health
      • WHOIS Lookup
      View All SuperTools
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Frequently Asked Questions

Find answers to common questions about email testing, deliverability, DNS, network tools, and more.

Email Tools

Visit: /email-tools

#1

What is email deliverability?

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#2

Why do emails go to spam?

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#3

How do spam filters work?

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#4

What affects inbox placement?

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#5

What is an email testing tool?

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#6

How often should you test emails before sending?

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#7

What is transactional vs marketing email?

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#8

What is email warm-up and why is it important?

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Test Mail

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#9

How do I test an email before sending?

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#10

What is a seed email test?

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#11

What happens when you send a test email?

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#12

Can test emails affect sender reputation?

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#13

Why does a test email land in spam?

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SMTP Server Test

Visit: /email-tools/smtp-server-test

#14

What is an SMTP server?

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#15

How do you test an SMTP server?

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#16

Why does SMTP connection fail?

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#17

What does an SMTP banner tell you?

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#18

How do SMTP timeouts affect delivery?

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#19

What SMTP ports are used for email sending?

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#20

What is STARTTLS in SMTP?

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Extract Email HTML

Visit: /email-tools/extract-email-html

#21

What is HTML in an email?

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#22

How can I extract HTML from an email?

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#23

Why does email HTML look different in browsers?

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#24

Can email HTML affect spam filtering?

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#25

What email clients modify HTML?

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Extract Email Text

Visit: /email-tools/extract-email-text

#26

What is the plain-text version of an email?

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#27

Why is plain-text email important?

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#28

How do I extract plain text from an email?

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#29

What happens if an email has no text part?

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Extract Email Attachments

Visit: /email-tools/extract-email-attachments

#30

How are email attachments encoded?

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#31

Why do email attachments get blocked?

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#32

How do I extract attachments from an email file?

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#33

What attachment types are unsafe in email?

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Email Header Analyzer

Visit: /email-tools/analyze-email-headers (Extract & Analyze Headers)

#34

What are email headers?

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#35

How do I extract full email headers?

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#36

Why are email headers important for troubleshooting?

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#37

What is the Received header in email?

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Analyzing Email Headers

Visit: /email-tools/analyze-email-headers (Complete Analysis Guide)

#38

How do you analyze email headers?

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#39

How can headers reveal email delays?

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#40

How do headers show SPF and DKIM results?

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#41

What does Authentication-Results mean?

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Extract Email Links

Visit: /email-tools/extract-email-links

#42

How can I extract links from an email?

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#43

Why do email links get flagged as malicious?

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#44

What is link tracking in emails?

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#45

How do redirects in email links work?

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SpamAssassin

Visit: /email-tools/spamassassin-email-test

#46

What is SpamAssassin?

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#47

How does SpamAssassin score emails?

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#48

What is a good SpamAssassin score?

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#49

Why does SpamAssassin mark my email as spam?

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#50

Can SpamAssassin false-positive legitimate emails?

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Email Authentication

Visit: /email-tools/email-authentication-check

#51

What is email authentication?

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#52

What is SPF and how does it work?

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#53

What is DKIM and how does it work?

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#54

What is DMARC and why is it important?

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#55

What is SPF, DKIM, and DMARC alignment?

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#56

What happens if email authentication fails?

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Spam Words

Visit: /email-tools/spam-words-checker

#57

What are spam trigger words?

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#58

Do spam words still matter in 2025?

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#59

How do spam words affect deliverability?

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#60

How can I reduce spam words in email content?

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HTML Validation

Visit: /email-tools/html-code-validator

#61

Why does invalid HTML break email rendering?

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#62

What HTML tags are not supported in emails?

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#63

How do you validate HTML code?

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#64

Why do email clients strip HTML?

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Email HTML Rendering

#65

Why does email HTML render differently in clients?

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#66

What is email client compatibility?

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#67

How do you test email rendering issues?

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#68

What causes broken layouts in email HTML?

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Email Source

Visit: /email-tools/email-source-analyzer

#69

What is email source code?

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#70

How do you analyze raw email source?

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#71

What is MIME in email?

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#72

How are multipart emails structured?

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SuperTools

Visit: /supertools

#73

What is DNS?

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#74

How does DNS lookup work?

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#75

What is an AAAA record?

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#76

What is a TXT record?

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#77

What is an SOA record?

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#78

What is an MX record?

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#79

What is an NS record?

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#80

What is a CNAME record?

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#81

What is an SRV record?

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#82

What is DNSSEC?

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#83

What is a DNSKEY record?

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#84

What is a DS record?

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#85

What is an RRSIG record?

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#86

What is NSEC3PARAM?

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#87

Why does DNSSEC validation fail?

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#88

What is an SPF record?

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#89

What does SPF PermError mean?

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#90

What is a DKIM selector?

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#91

How does DMARC policy work?

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#92

What is BIMI?

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#93

What is MTA-STS?

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#94

Why is email DNS misconfiguration dangerous?

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#95

What is ping?

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#96

What is traceroute?

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#97

Why does traceroute fail?

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#98

What is TCP connectivity testing?

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#99

What is TLS?

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#100

How does HTTPS differ from HTTP?

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#101

What is a TLS certificate?

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#102

How does TLS handshake work?

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#103

What is a certificate chain?

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#104

Why do TLS certificates expire?

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#105

What causes TLS handshake failures?

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#106

What is an IP address?

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#107

What is IPv4 vs IPv6?

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#108

What is reverse DNS?

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#109

What is ARIN?

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#110

What is an ASN?

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#111

How does IP geolocation work?

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#112

Why does IP location show wrong country?

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#113

What is my public IP address?

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#114

Can my IP address change?

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#115

What is a private IP address?

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#116

How does a VPN affect my IP?

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#117

What is domain health?

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#118

How do you check domain reputation?

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#119

What causes a domain to be blacklisted?

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#120

How long does domain reputation recovery take?

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Email Tools

Extraction Tools
  • Extract HTML
  • Extract Text
  • Extract & Analyze Headers
  • Extract Attachments
  • Extract Links
Analysis & Testing
  • SMTP Server Test
  • SpamAssassin Test
  • Email Authentication Check
  • Spam Words Checker
  • HTML Code Validator
View All Email Tools

SuperTools

  • DNS Lookup
  • MX Lookup
  • SPF Lookup
  • DMARC Lookup
  • DKIM Lookup
  • WHOIS Lookup
  • Ping
  • Traceroute
  • Domain Health Check
  • What is My IP
View All SuperTools

FAQ

  • What is Email Deliverability
  • Why Emails Go to Spam
  • How Spam Filters Work
  • What is SPF
  • What is DKIM
  • What is DMARC
  • How to Test SMTP Server
  • What are Email Headers
  • What is SpamAssassin
  • What is DNS
View All FAQs

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