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This shows you the differences between two versions of the page.

--- email:spf [2026/07/21 18:01] – created - external edit 127.0.0.1
+++ email:spf [2026/08/11 04:05] (current) – removed - external edit (Unknown date) 127.0.0.1
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-====== SPF — Sender Policy Framework ======
-SPF (Sender Policy Framework) is an email authentication method that prevents spammers from sending emails using your domain.
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-===== What is SPF? =====
-SPF allows domain owners to specify which mail servers are authorized to send emails on their behalf.
-When a receiving mail server gets an email, it checks:
-. The envelope sender domain (Return-Path)
-. The IP address of the sending server
-. The SPF record published by the domain owner
-. If the IP is authorized, SPF passes; otherwise, it fails
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-===== SPF Record Format =====
-An SPF record is a TXT record published in the domain's DNS:
-| example.com. TXT "v=spf1 include:_spf.google.com ~all"
-**Components:**
-^ Component ^ Description ^
-| **v=spf1** | Version (must be exactly this) |
-| **Mechanisms** | Who is allowed to send |
-| **Qualifier** | What to do with unauthorized senders |
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-===== SPF Mechanisms =====
-^ Mechanism ^ Meaning ^
-| `a` | The domain's A record IP address |
-| `mx` | The domain's MX record IP addresses |
-| `include` | Include SPF records from another domain |
-| `ip4` | A specific IPv4 address |
-| `ip6` | A specific IPv6 address |
-| `ptr` | PTR record (reverse lookup) |
-| `exists` | Check if a domain exists |
-| `all` | Everything else (catch-all) |
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-===== SPF Qualifiers =====
-^ Qualifier ^ Meaning ^
-| **+** | Pass — authorized (default) |
-| **-** | Fail — hard fail (reject) |
-| **~** | Soft Fail — mark as spam |
-| **?** | Neutral — no policy |
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-===== Common SPF Examples =====
-**Google Workspace (Gmail):**
-| v=spf1 include:_spf.google.com ~all
-**Microsoft 365:**
-| v=spf1 include:spf.protection.outlook.com ~all
-**Custom (self-hosted):**
-| v=spf1 a mx ip4:192.168.1.0/24 ~all
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-===== SPF Lookup Limits =====
-SPF has a hard limit of **10 DNS lookups**. If you exceed this, receivers may reject your email.
-**Lookup mechanisms:**
-  * include
-  * a
-  * mx
-  * ptr
-  * exists
-  * redirect
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-===== SPF Policy Levels =====
-^ Level ^ Policy ^ Description ^
-| **Strong** | `-all` | Hard fail — unlisted senders are rejected |
-| **Moderate** | `~all` | Soft fail — unlisted senders go to spam |
-| **Weak** | `?all` | Neutral — no policy applied |
-| **Dangerous** | `+all` | Pass all — effectively no protection |
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-===== Test Your SPF =====
-Use our [[https://telenegar.ir/mailcheck/|Mail Check tool]] to verify your SPF, DKIM, and DMARC records.
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-{{tag>email spf authentication}}