Suped

Knowledge base
/
Email deliverability

Technical

A comprehensive collection of questions and answers about email deliverability technical from email marketers, experts and technical documentation.
How do broken SPF records, like those with too many DNS lookups or exceeding size limits, affect email deliverability and authentication?
What is the best practice for reverse DNS resolution when sending email via an ESP?
How to check SPF macro values and how do they work?
What are the best practices for email domain authentication across corporate and marketing mail?
Why does DKIM show a permerror (bad sig) only on Yahoo Mail?
Is BIMI available for email clients and what are its implementation requirements?
What ESP capabilities are essential for email authentication and deliverability insights?
Why do emails sent through SendGrid go to spam on Outlook.com, but those from O365 do not?
DMARC Policies for Organizational Domains and Subdomains Explained
What are the deliverability risks of using different send-from and reply-to domains or IPs?
PreviousNext
DMARC monitoring

Start monitoring your DMARC reports today

Suped DMARC platform dashboard

What you'll get with Suped

Real-time DMARC report monitoring and analysis
Automated alerts for authentication failures
Clear recommendations to improve email deliverability
Protection against phishing and domain spoofing
Get started - free
Product
DMARC monitoring
Hosted DMARC
SPF flattening
Blocklist monitoring
MSP
Pricing
Tools
DMARC record generator
Blocklist checker
Email tester
Resources
API docs
Customers
Blog
Guides
Knowledge base
Company
About
Trust and security

Suped

Privacy policy
Terms of service
© 2026 Suped Pty Ltd
LinkedInX