MailX Email Deliverability
Check SPF/DKIM/DMARC/BIMI, blacklists, SMTP/IMAP; DNS lookups; generate email DNS records.
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What it can do
What data it sees
Do you need an account
No: the server works without sign-in
Check SPF/DKIM/DMARC/BIMI, blacklists, SMTP/IMAP; DNS lookups; generate email DNS records.
Server tool list (16)
Raw names from tools/list. Only developers need these.
| spf_check | Check if a domain has a valid SPF (Sender Policy Framework) DNS record. SPF specifies which mail servers are authorized to send email on behalf of a domain. |
| dkim_check | Check if a domain has a valid DKIM (DomainKeys Identified Mail) DNS record for a given selector. DKIM allows the receiver to verify that an email was sent by the domain owner. |
| dmarc_check | Check if a domain has a valid DMARC (Domain-based Message Authentication, Reporting & Conformance) DNS record. DMARC tells receiving servers what to do with emails that fail SPF or DKIM checks. |
| bimi_check | Check if a domain has a valid BIMI (Brand Indicators for Message Identification) DNS record. BIMI allows brands to display their logo next to authenticated emails in supporting email clients. |
| dmarc_generate | Generate a DMARC DNS record for a domain. Returns the record name, value, and type ready to be added to DNS. |
| spf_generate | Generate an SPF DNS record for a domain based on the email provider being used. Returns the record name, value, and type ready to be added to DNS. |
| smtp_check | Test an SMTP server connection by attempting to connect and authenticate. If from_email and to_email are provided, the tool may attempt to send a test email. Only provide these fields if you are authorized to send from the account and intentionally want to test full sending capability. |
| imap_check | Test an IMAP server connection by attempting to connect and authenticate. Use this to verify email receiving configuration. |
| smtp_finder | Look up SMTP server settings (host, port, encryption) for a given email provider. Use this to find the correct SMTP configuration for services like Gmail, Outlook, SendGrid, etc. |
| imap_finder | Look up IMAP server settings (host, port, encryption) for a given email provider. Use this to find the correct IMAP configuration for services like Gmail, Outlook, Yahoo, etc. |
| blacklist_check | Check if a domain or IP address is listed in popular email blacklists (DNSBLs). Being blacklisted can severely impact email deliverability. |
| mx_lookup | Look up MX (Mail Exchanger) records for a domain. Returns the mail servers and their priorities. |
| txt_lookup | Look up all TXT records for a domain. TXT records contain SPF policies, domain verification tokens, DKIM keys, and other metadata. |
| cname_lookup | Look up CNAME (Canonical Name) records for a domain. Shows where a hostname aliases to. |
| ptr_lookup | Reverse DNS lookup. Find the hostname associated with an IP address. A valid PTR record is important for email sending reputation. |
| dns_lookup | Look up all DNS records for a domain in one query. Returns A, AAAA, CNAME, MX, NS, TXT, and SOA records. |