Suped

Knowledge base
/
Email deliverability

Technical

A comprehensive collection of questions and answers about email deliverability technical from email marketers, experts and technical documentation.
Why does Google domain verification with TXT records fail and CNAME records work better?
How do email service providers manage soft and hard bounces, bounce codes, and soft bounce tolerance?
What causes OpenDKIM to incorrectly validate DKIM signatures for emails with long headers?
How to troubleshoot DKIM implementation issues and understand ARC-Seal in email headers?
What is the return path email address, what is its purpose, and what are the best practices for its naming and monitoring?
What is Yahoo's policy on inactive email accounts and what bounce type is returned?
Why is SpamAssassin not relevant for modern email deliverability and what truly impacts inbox placement?
Why do spambots submit real emails to signup forms?
How to find domainGUID and initialDomain for DKIM setup with custom domains in Office 365?
How to prevent email throttling and delays from Hotmail, Comcast, and other email clients?
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