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Illustration showing a domain being checked against Spamhaus and other reputation blocklists for spam, phishing, and malicious activity.
Domain Security

How to Check If Your Domain Is Blacklisted

Check your domain against Spamhaus's DBL and SURBL to see if your brand name itself is flagged, separate from any hosting server issue. Common causes include compromised sites, spam content, and missing SPF/DKIM/DMARC. Fix the root cause before requesting delisting; changing hosts alone won't help.

Illustration of authenticating Mailgun or SendGrid with DNS records on a dedicated transactional email subdomain while keeping primary business email separate.
Email

How to Authenticate Third-Party SMTP Services via DNS

Authenticate Mailgun (TXT-based SPF/DKIM, optional MX/CNAME) or SendGrid (CNAME-based, typically 3 records) via NameSilo's DNS Manager. Always use a dedicated subdomain like mg.yourbrand.com, never your root domain, and never replace your existing MX records, which would break normal incoming corporate email.

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