Cold Email & Outreach
How to Avoid the Spam Folder: SPF, DKIM, and DMARC Setup Guide
Priya Sharma
Lead Deliverability & Outreach Specialist
October 10, 2026 9 min read
TL;DR / Quick Summary
To permanently avoid the spam folder, publish an SPF TXT record authorizing your sending host, a 2048-bit DKIM cryptographic selector key, and a DMARC policy with alignment to prevent email spoofing.
Understanding DMARC Policies: None vs Quarantine vs Reject
A DMARC policy tells destination mailboxes what to do when an email fails authentication:
p=none (Monitor only, zero protection)
p=quarantine (Delivers suspected messages to spam/junk folders)
p=reject (Blocks unauthorized messages outright at the server gate)
For cold email domains, standard best practice begins at p=none for 14 days, followed by p=quarantine once DKIM alignment is verified.
Frequently Asked Questions
Can I have multiple SPF records on one domain?
Never. Multiple SPF records cause permanent DNS syntax errors (PermError), automatically failing authentication. Merge all hosts into one single v=spf1 record.
Written by Priya Sharma
Lead Deliverability & Outreach Specialist
Specializes in cold email inbox placement, SPF/DKIM/DMARC server infrastructure, and anti-spam deliverability algorithms.
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