SPF record checker

SPF record checker কীভাবে ব্যবহার করবেন

এটি কী হিসাব করে এবং কখন ব্যবহার করবেন

Reads a domain’s SPF record, servers allowed থেকে send email-এর the listটি it,-এ ও checks itটি common faults: more than one record-এ, a missing “all” policy, ও more than 10 DNS lookups, which makes SPF fail. It follows include records থেকে count the lookups.

ধাপে ধাপে ব্যবহারের নিয়ম

1. Enter the domain,টি উদাহরণ উদাহরণ.com.-এ
2. Press “Check SPF”.
3. Read the verdict ও 10.-এর DNS lookups used out-এর the number
4. Review the mechanisms list ও any warnings.

প্রতিটি ইনপুটের অর্থ

• Domain নাম – the sender’s address.-এ The domain used

ফলাফল কীভাবে পড়বেন

• Verdict – Looks valid, বা Needs attention when a problem হলো found.
• Policy – What happens থেকে mail from servers that are not listed: hard fail, soft fail, neutral বা allow.
• DNS lookups – Lookups needed by include, a, mx, ptr, exists ও 10.-এর redirect terms, compared with the limit
• Mechanisms – the record, with included records indented beneath their parent.-এ Every মেয়াদ

সূত্র

The record হলো the TXT value starting v=spf1. Each include, a, mx, ptr, exists বা redirect term costs one DNS lookup, ও included records add their own. ip4 ও ip6 terms ও “all” cost none. The RFC limit হলো 10 lookups.

একটি সমাধান করা উদাহরণ

v=spf1 include:_spf.উদাহরণ.net a mx -all uses three lookupsটি its own terms plus those inside the included record, ও -all, so unlisted servers are rejected.-এ ends-এ

অনুমান ও সীমাবদ্ধতা

• দরে most 15 queries are made while following includes, ও nesting stops after 5 levels.
• A domain may need a record onlyটি mail it sends. Domains that send না mail should publish v=spf1 -all.-এ
• The check does not test whether a particular server would pass.

সাধারণ ভুল

• Publishing two SPF records. Only one হলো allowed, so merge them into one.
• Ending with +all, which lets anyone send as your domain.
• Adding every email service as an include ও passing 10 lookups, which পাক SPF into a permanent error.

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