deliverlensSPF, without the guesswork
Check an SPF record safely
Inspect the exact sender identity and review one policy without overwriting legitimate senders.
2 min read
The Deliverlens academy
Good email starts with understanding.
Less guesswork. More useful evidence. Learn how email authentication, reputation and receiving systems fit together—one practical question at a time.
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Email foundations10 lessons available SPF, without the guesswork10 lessons available DKIM & message integrity10 lessons available DMARC & domain protection10 lessons available BIMI & brand indicators10 lessons available Email verification10 lessons available Lists that people want10 lessons available Reputation & blocklists10 lessons available Inbox placement10 lessons available Deliverability operations10 lessons available
A little clarity, on demand.
10 published lessons found.
SPF, without the guesswork
Fix multiple SPF records at one DNS name
Consolidate authorized sources into one reviewed policy and preserve unrelated TXT records.
2 min read
SPF, without the guesswork
Investigate the SPF DNS lookup limit
Trace lookup-causing terms and dependencies rather than counting all DNS queries equally.
2 min read
SPF, without the guesswork
Understand include vs. redirect in SPF
Compare authorization composition with policy delegation using a worked DNS example.
2 min read
SPF, without the guesswork
Choose between softfail and fail deliberately
Review the meaning and operational tradeoffs of the final all mechanism.
2 min read
SPF, without the guesswork
Authorize a new email service without breaking the old one
Plan a provider change with an inventory, DNS review, and fresh message tests.
2 min read
SPF, without the guesswork
Why forwarding can change an SPF result
Follow the connecting-IP change and distinguish it from DKIM and DMARC outcomes.
2 min read
SPF, without the guesswork
Remove an obsolete SPF include
Verify that a retired sender is unused and measure the effect before deleting authorization.
2 min read
SPF, without the guesswork
Plan a custom return-path domain
Check provider support and the relationship between envelope identity and alignment.
2 min read
SPF, without the guesswork
Document SPF maintenance for your team
Assign ownership and a review checklist for future sending-service changes.
2 min read