Guides and practical notes on SPF, DMARC, and email deliverability.
· 4 min read
No magic "flatten SPF" button in Cloudflare. Here is why DNS alone cannot solve the 10-lookup limit - and how to plug spFlat! into your Cloudflare TXT record.
Read article →· 5 min read
A TXT string maxes out at 255 octets, and dumping IPs on your domain makes it worse. SPFlat! publishes one short include and keeps the IP list current.
Read article →· 6 min read
Need SPF flattening without a full DMARC platform? SPFlat! is built for that job. See how it compares with EasyDMARC and dmarcian - then check your lookups free.
Read article →· 6 min read
A typical Google + Microsoft 365 + SendGrid + Mailgun stack is already over 10 lookups. Check your domain free on SPFlat! and publish one include that stays current.
Read article →· 6 min read
An include: in your SPF record is never just one lookup. Here is how include chains nest, with worked examples from Google, Microsoft, and a typical company record.
Read article →· 5 min read
As your business grows, so does the number of third-party platforms sending email on your behalf. Flatten your SPF record before you hit the 10-lookup limit.
Read article →· 4 min read
If your SPF record exceeds the 10-DNS-lookup limit, receiving mail servers reject it with a PermError - a permanent error. Here is how to fix it for good.
Read article →· 6 min read
SPF, DKIM, and DMARC are often mentioned together, but they do fundamentally different things. Here is what each one actually does, in plain language.
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