Email security
What Is a Secure Email Gateway?
Understand how a secure email gateway filters incoming mail, where it fits in your mail flow and how to compare security with email continuity.
Read articleTHE MAILFLOW BLOG
Clear answers for resilient business email.
Practical guidance on incoming protection, secondary MX routing and email authentication.
Email continuity
Backup MX and Secondary MX: What Your Business Needs
Learn what Backup MX and secondary MX mean, how standby email queuing works and which limits to check before adding a backup mail exchanger.
Read articleDNS and delivery
MX Record Priority and Email Failover Explained
Read MX priorities correctly, distinguish equal-priority routing from secondary MX failover and avoid common backup mail configuration mistakes.
Read articleEmail authentication
SPF, DKIM and DMARC: What DNS Records Can Tell You
Understand SPF, DKIM and DMARC lookups, what each published record means and why a DNS result alone cannot prove authentication or inbox placement.
Read articleEmail continuity
A Business Email Outage Response Checklist
A practical response plan for an email outage: define the affected mail flow, protect queued messages and verify recovery before closing the incident.
Read articleEmail operations
Email Queue, Quarantine and Archive: Three Different Jobs
Understand the difference between an email delivery queue, security quarantine and mailbox archive so your continuity and recovery plans match the service.
Read articleDelivery troubleshooting
How to Read an Email Non-Delivery Report
Turn a bounced email into a useful support case by identifying the failed recipient, remote response, timeline and next action without exposing message content.
Read articleEmail administration
A Practical Business Email Migration Checklist
Plan a business email migration around ownership, DNS, receiving destinations, sending applications and controlled tests instead of treating it as one MX change.
Read articleEmail administration
Email Aliases and Shared Addresses: Keep Ownership Clear
Organize aliases and shared business addresses with named owners, clear access rules, lifecycle reviews and a separate plan for quarantine permissions.
Read articleDelivery troubleshooting
Why Email Attachment Size Can Affect Delivery
Diagnose oversized email by checking the complete message, sender and receiver limits, application output and the difference between MB and MiB.
Read articleEmail security
A Clear Workflow for Reviewing Suspicious Email
Give employees and administrators a repeatable suspicious-email review process with safe reporting, controlled quarantine handling and documented decisions.
Read articleEmail authentication
Build an Inventory of Every Business Email Sender
Track mailbox platforms, business applications, websites and devices that send for your domains before changing authentication or an SMTP route.
Read articleDNS and delivery
An Email DNS Change Checklist That Is Easy to Verify
Make email DNS changes with a recorded baseline, clear ownership, controlled verification and an explicit rollback instead of changing several mail routes at once.
Read articleDelivery troubleshooting
Build a Useful Timeline for an Email Delivery Investigation
Trace a missing or delayed email using timestamps, message and queue identifiers, confirmed handoffs and a concise closure note without confusing transport with reading.
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