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BNবাংলা#SPF
SPF (Sender Policy Framework) is a DNS TXT record that lists the servers allowed to send e-mail for a domain. Receiving servers compare the connecting server with this list and treat unlisted senders with suspicion. A domain may publish only one SPF record, and the record may trigger at most ten DNS lookups during evaluation. Mistakes such as duplicate records or too many include statements are among the most common reasons for failed authentication. The articles under this tag cover SPF syntax, limits, qualifiers and troubleshooting.
26 sept. 2026 · 8 min de lectureSPF Record Examples for Common Small Business Setups
Practical SPF record examples for Google Workspace, Microsoft 365, website mail, newsletter tools, own servers and parked domains, with the pitfalls to avoid.
22 sept. 2026 · 8 min de lectureHow to Protect Parked and Unused Domains from Email Abuse
Domains you never use for mail can still be spoofed. Learn the three DNS records that lock down a parked domain and how to…
14 sept. 2026 · 7 min de lectureHow to Authenticate Third-Party Email Senders for Your Domain
CRMs, helpdesks, newsletter and invoicing tools often send as your domain without proper authentication. Learn how to find them and align each with DMARC.
9 sept. 2026 · 7 min de lectureSPF Softfail vs Hardfail: Should You Use ~all or -all?
Should your SPF record end with ~all or -all? Learn what softfail and hardfail do, how receivers treat them with DMARC, and which ending…
8 sept. 2026 · 8 min de lectureDMARC Alignment Explained: Relaxed vs Strict Mode
DMARC passes only when SPF or DKIM aligns with your From domain. Learn how relaxed and strict alignment differ, and which mode suits your…
28 août 2026 · 8 min de lectureHow to Read Email Headers to Check SPF, DKIM and DMARC
E-mail headers show exactly why a message passed or failed authentication. Learn how to open them in Gmail and Outlook and read Authentication-Results.
27 août 2026 · 8 min de lectureEmail Forwarding and Authentication: SPF, SRS and ARC Explained
Forwarded e-mail often fails SPF and sometimes DMARC. Learn why forwarding breaks authentication and how DKIM, SRS and ARC keep forwarded mail deliverable.
16 août 2026 · 8 min de lectureEmail Spoofing: How to Stop People Sending Mail as Your Domain
Criminals can send e-mail that looks like it comes from your domain. Learn how spoofing works, which records stop it and what DMARC cannot…
14 août 2026 · 8 min de lectureGoogle Workspace SPF, DKIM and DMARC Setup, Step by Step
Set up SPF, DKIM and DMARC correctly for Google Workspace: the exact records, where to enable DKIM signing, and how to confirm everything passes…
8 août 2026 · 8 min de lectureSPF Too Many DNS Lookups: How to Fix the 10-Lookup Limit
An SPF record that needs more than ten DNS lookups fails with a permerror. Learn how to count lookups, what to remove and when…
5 août 2026 · 8 min de lectureSPF vs DKIM vs DMARC: What Each One Does and Why You Need All
SPF, DKIM and DMARC solve different parts of e-mail trust. See what each checks, how they work together and in which order to set…
1 août 2026 · 8 min de lectureSPF Record Explained: What It Does and How to Set It Up
Learn what an SPF record is, how receiving servers check it, how to write one for every service that sends your mail, and the…