# Mailrith Free Email Tools > Free tools for email address checks, bulk list cleanup, real deliverability testing, sender-domain health, DNS authentication, SPF, DKIM, DMARC, BIMI, MTA-STS, TLS reporting, SMTP TLS readiness, PTR, IP reputation, headers, links, subject lines, preview text, HTML size, and spam-content review. - Human page: https://mailrith.com/free-tools - Markdown page: https://mailrith.com/free-tools/index.html.md - Tool count: 23 Use these tools when planning a send, cleaning a subscriber import, debugging authentication, or explaining what a sender should fix next. Agent notes: - Prefer individual tool markdown pages for exact input, output, limitations, and related fix guides. - Most tools are browser-based. The Email Deliverability Tester uses a temporary Mailrith test address and server-side received-message analysis. - The human pages include interactive controls; the markdown pages are for retrieval and planning context. ## Tool Categories - [List Quality](https://mailrith.com/free-tools/index.html.md): Check addresses and subscriber lists before they create bounces, complaints, or wasted sends. Includes 2 tools. - [Email Authentication](https://mailrith.com/free-tools/index.html.md): Check the public DNS records that help inboxes trust your sending domain. Includes 12 tools. - [Reputation](https://mailrith.com/free-tools/index.html.md): Check sender-domain and mail-server signals that can affect whether inboxes trust your email. Includes 4 tools. - [Email Content](https://mailrith.com/free-tools/index.html.md): Check email copy, links, subject lines, and compliance signals before a campaign is sent. Includes 5 tools. ## Tools by Category ### List Quality - [Email Checker](https://mailrith.com/free-tools/email-checker.md): Free email checker for syntax, MX records, disposable domains, role addresses, typo suggestions, and plain-English fixes before you send. - [Bulk Email List Checker](https://mailrith.com/free-tools/bulk-email-list-checker.md): Free bulk email list checker for CSV and pasted lists. Find invalid, risky, duplicate, disposable, role-based, and typo-prone emails with exportable results. ### Email Authentication - [SPF Checker](https://mailrith.com/free-tools/spf-checker.md): Free SPF checker for DNS TXT records, duplicate SPF records, include and redirect lookup counts, all mechanisms, and clear SPF fix guidance. - [DKIM Checker](https://mailrith.com/free-tools/dkim-checker.md): Free DKIM checker for selector records, TXT and CNAME lookups, missing keys, revoked keys, test mode, and DKIM fix guidance. - [DMARC Checker](https://mailrith.com/free-tools/dmarc-checker.md): Free DMARC checker for policy, rua reports, alignment, pct rollout, duplicate records, and exact DMARC fix guidance. - [MX Record Checker](https://mailrith.com/free-tools/mx-record-checker.md): Free MX record checker for mail server lookup, missing MX records, fallback address records, mail host review, and simple fix guidance. - [Email Header Analyzer](https://mailrith.com/free-tools/email-header-analyzer.md): Free email header analyzer for SPF, DKIM, DMARC, Return-Path, DKIM d=, Authentication-Results, Received headers, and alignment review. - [BIMI Checker](https://mailrith.com/free-tools/bimi-checker.md): Free BIMI checker for default._bimi TXT records, logo URL, VMC or CMC certificate URL, DMARC policy, and BIMI fix guidance. - [MTA-STS Checker](https://mailrith.com/free-tools/mta-sts-checker.md): Free MTA-STS checker for _mta-sts TXT records, MX records, policy URL guidance, TLS reporting pairing, and plain-English setup notes. - [TLS-RPT Checker and Generator](https://mailrith.com/free-tools/tls-rpt-checker.md): Free TLS-RPT checker and generator for _smtp._tls TXT records, rua destinations, missing records, and SMTP TLS reporting setup guidance. - [SMTP TLS Checker](https://mailrith.com/free-tools/smtp-tls-checker.md): Free SMTP TLS checker for MX records, MTA-STS, TLS-RPT, STARTTLS check guidance, and secure mail transport readiness notes. - [SPF Record Generator](https://mailrith.com/free-tools/spf-record-generator.md): Free SPF record generator for common email providers, include mechanisms, IP addresses, lookup-limit warnings, and simple SPF publishing guidance. - [DMARC Record Generator](https://mailrith.com/free-tools/dmarc-record-generator.md): Free DMARC record generator for p=none, quarantine, reject, rua reports, pct rollout, alignment defaults, and safe DMARC publishing guidance. - [Reverse DNS PTR Checker](https://mailrith.com/free-tools/reverse-dns-ptr-checker.md): Free reverse DNS PTR checker for IPv4 addresses, mail-server IPs, PTR hostnames, forward-confirmed reverse DNS, and setup guidance. ### Reputation - [Email Domain Health Checker](https://mailrith.com/free-tools/email-domain-health-checker.md): Free email domain health checker for MX, SPF, DKIM discovery, DMARC, mail-server IPs, and sender-domain readiness with exact fix guidance. - [Email Blacklist Checker](https://mailrith.com/free-tools/email-blacklist-checker.md): Free email blacklist checker for mail-server IPs, DNSBL lookups, listing warnings, and plain-English blacklist fix guidance. - [Email Deliverability Tester](https://mailrith.com/free-tools/email-deliverability-tester.md): Free email deliverability tester. Send a real test email and check SPF, DKIM, DMARC, alignment, sending IP, blocklists, unsubscribe headers, links, content, and fix steps. - [IP Reputation Checker](https://mailrith.com/free-tools/ip-reputation-checker.md): Free IP reputation checker for sending IPs, mail-server IP discovery, public DNSBL checks, PTR review, and email reputation fix guidance. ### Email Content - [Email Spam Checker](https://mailrith.com/free-tools/email-spam-checker.md): Free email spam checker for subject lines, preview text, body copy, links, promotional language, unsubscribe signals, and actionable content fixes. - [Email Subject Line Tester](https://mailrith.com/free-tools/email-subject-line-tester.md): Free email subject line tester for length, mobile clipping, all-caps risk, punctuation, spammy phrases, and plain-English rewrite tips. - [Email Preview Text Checker](https://mailrith.com/free-tools/email-preview-text-checker.md): Free email preview text checker for length, subject repetition, mobile snippet quality, missing preview text, and practical rewrite guidance. - [HTML Email Size Checker](https://mailrith.com/free-tools/html-email-size-checker.md): Free HTML email size checker for Gmail clipping risk, byte size, image count, script and form warnings, and simple email HTML cleanup guidance. - [Email Link Checker](https://mailrith.com/free-tools/email-link-checker.md): Free email link checker for HTTP links, URL shorteners, mismatched visible URLs, link count, destination domains, and email link reputation guidance. ## Tools - [Email Checker](https://mailrith.com/free-tools/email-checker.md): Free email checker for syntax, MX records, disposable domains, role addresses, typo suggestions, and plain-English fixes before you send. - [Bulk Email List Checker](https://mailrith.com/free-tools/bulk-email-list-checker.md): Free bulk email list checker for CSV and pasted lists. Find invalid, risky, duplicate, disposable, role-based, and typo-prone emails with exportable results. - [SPF Checker](https://mailrith.com/free-tools/spf-checker.md): Free SPF checker for DNS TXT records, duplicate SPF records, include and redirect lookup counts, all mechanisms, and clear SPF fix guidance. - [DKIM Checker](https://mailrith.com/free-tools/dkim-checker.md): Free DKIM checker for selector records, TXT and CNAME lookups, missing keys, revoked keys, test mode, and DKIM fix guidance. - [DMARC Checker](https://mailrith.com/free-tools/dmarc-checker.md): Free DMARC checker for policy, rua reports, alignment, pct rollout, duplicate records, and exact DMARC fix guidance. - [Email Domain Health Checker](https://mailrith.com/free-tools/email-domain-health-checker.md): Free email domain health checker for MX, SPF, DKIM discovery, DMARC, mail-server IPs, and sender-domain readiness with exact fix guidance. - [Email Blacklist Checker](https://mailrith.com/free-tools/email-blacklist-checker.md): Free email blacklist checker for mail-server IPs, DNSBL lookups, listing warnings, and plain-English blacklist fix guidance. - [Email Spam Checker](https://mailrith.com/free-tools/email-spam-checker.md): Free email spam checker for subject lines, preview text, body copy, links, promotional language, unsubscribe signals, and actionable content fixes. - [Email Deliverability Tester](https://mailrith.com/free-tools/email-deliverability-tester.md): Free email deliverability tester. Send a real test email and check SPF, DKIM, DMARC, alignment, sending IP, blocklists, unsubscribe headers, links, content, and fix steps. - [MX Record Checker](https://mailrith.com/free-tools/mx-record-checker.md): Free MX record checker for mail server lookup, missing MX records, fallback address records, mail host review, and simple fix guidance. - [Email Header Analyzer](https://mailrith.com/free-tools/email-header-analyzer.md): Free email header analyzer for SPF, DKIM, DMARC, Return-Path, DKIM d=, Authentication-Results, Received headers, and alignment review. - [BIMI Checker](https://mailrith.com/free-tools/bimi-checker.md): Free BIMI checker for default._bimi TXT records, logo URL, VMC or CMC certificate URL, DMARC policy, and BIMI fix guidance. - [MTA-STS Checker](https://mailrith.com/free-tools/mta-sts-checker.md): Free MTA-STS checker for _mta-sts TXT records, MX records, policy URL guidance, TLS reporting pairing, and plain-English setup notes. - [TLS-RPT Checker and Generator](https://mailrith.com/free-tools/tls-rpt-checker.md): Free TLS-RPT checker and generator for _smtp._tls TXT records, rua destinations, missing records, and SMTP TLS reporting setup guidance. - [SMTP TLS Checker](https://mailrith.com/free-tools/smtp-tls-checker.md): Free SMTP TLS checker for MX records, MTA-STS, TLS-RPT, STARTTLS check guidance, and secure mail transport readiness notes. - [SPF Record Generator](https://mailrith.com/free-tools/spf-record-generator.md): Free SPF record generator for common email providers, include mechanisms, IP addresses, lookup-limit warnings, and simple SPF publishing guidance. - [DMARC Record Generator](https://mailrith.com/free-tools/dmarc-record-generator.md): Free DMARC record generator for p=none, quarantine, reject, rua reports, pct rollout, alignment defaults, and safe DMARC publishing guidance. - [Email Subject Line Tester](https://mailrith.com/free-tools/email-subject-line-tester.md): Free email subject line tester for length, mobile clipping, all-caps risk, punctuation, spammy phrases, and plain-English rewrite tips. - [Email Preview Text Checker](https://mailrith.com/free-tools/email-preview-text-checker.md): Free email preview text checker for length, subject repetition, mobile snippet quality, missing preview text, and practical rewrite guidance. - [HTML Email Size Checker](https://mailrith.com/free-tools/html-email-size-checker.md): Free HTML email size checker for Gmail clipping risk, byte size, image count, script and form warnings, and simple email HTML cleanup guidance. - [Email Link Checker](https://mailrith.com/free-tools/email-link-checker.md): Free email link checker for HTTP links, URL shorteners, mismatched visible URLs, link count, destination domains, and email link reputation guidance. - [Reverse DNS PTR Checker](https://mailrith.com/free-tools/reverse-dns-ptr-checker.md): Free reverse DNS PTR checker for IPv4 addresses, mail-server IPs, PTR hostnames, forward-confirmed reverse DNS, and setup guidance. - [IP Reputation Checker](https://mailrith.com/free-tools/ip-reputation-checker.md): Free IP reputation checker for sending IPs, mail-server IP discovery, public DNSBL checks, PTR review, and email reputation fix guidance.