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Email deliverability is crucial for successful cold email campaigns. If your emails land in spam, your efforts are wasted. Properly configuring SPF, DKIM, and DMARC ensures inbox placement. Below are verified steps, commands, and best practices to optimize email infrastructure.
You Should Know:
1. SPF (Sender Policy Framework)
SPF prevents email spoofing by specifying which servers can send emails for your domain.
Steps to Set Up SPF:
- Access DNS Settings (Go to your domain registrar or hosting provider).
2. Add a TXT Record:
v=spf1 include:_spf.maildoso.com ~all
(Replace `_spf.maildoso.com` with your email service provider’s SPF record.)
Verify SPF:
dig TXT yourdomain.com
(Ensure the record matches your SPF entry.)
2. DKIM (DomainKeys Identified Mail)
DKIM adds a digital signature to emails, proving they weren’t altered in transit.
Steps to Set Up DKIM:
- Generate DKIM Keys (Most providers like Maildoso auto-generate them).
2. Add a DNS TXT Record:
mail._domainkey.yourdomain.com IN TXT "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC..."
Verify DKIM:
nslookup -type=TXT mail._domainkey.yourdomain.com
3. DMARC (Domain-based Message Authentication, Reporting & Conformance)
DMARC tells receiving servers what to do if SPF/DKIM checks fail.
Steps to Set Up DMARC:
1. Add a DMARC TXT Record:
_dmarc.yourdomain.com IN TXT "v=DMARC1; p=none; rua=mailto:[email protected]"
– `p=none` (Monitor only)
– `p=quarantine` (Mark as spam if failed)
– `p=reject` (Block if failed)
Verify DMARC:
dig TXT _dmarc.yourdomain.com
Linux/Windows Commands for Testing Email Security
- Check MX Records:
nslookup -type=MX yourdomain.com
- Test Email Headers (Linux):
curl -v smtp://mail.yourdomain.com
- Analyze DMARC Reports (Linux):
grep "DMARC" /var/log/mail.log
- Windows PowerShell (Check DNS):
Resolve-DnsName -Type TXT yourdomain.com
What Undercode Say
Email deliverability is a mix of authentication (SPF/DKIM/DMARC), reputation monitoring, and proper DNS configuration. Tools like Maildoso automate this, but understanding the underlying tech ensures long-term success.
For manual setups, always:
✔ Monitor logs (`tail -f /var/log/mail.log`).
✔ Test with tools like MXToolbox.
✔ Warm up domains before bulk sending.
Expected Output:
- SPF, DKIM, DMARC properly configured.
- Emails reach the primary inbox (98% deliverability).
- Reduced spam complaints & improved sender reputation.
For more details, visit: Maildoso.
This guide ensures high deliverability—whether you use automation or manual setups. Implement these steps, and your cold emails will avoid spam folders.
References:
Reported By: Leadgenmanthan So – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
