MX Record Configuration: How Your Mail Server Setup Affects Deliverability

MX Record Configuration and Email Deliverability

MX records tell the internet where to deliver email for your domain. Poor MX configuration leads to bounces, delays, and reputation damage.

What MX Records Do

Mail Exchanger records are DNS entries that specify mail servers for a domain. Each record has a priority number — lower numbers are tried first. Multiple records provide redundancy.

Common MX Misconfigurations

The most common mistakes: no MX records at all, pointing to non-existent servers, missing backup MX servers, priority numbers that route to spam filters instead of mailboxes, and stale records pointing to old infrastructure.

MX Redundancy and Deliverability

Domains with multiple MX records (primary + backup) signal to verification services that the domain is well-maintained. MailEntriX uses MX redundancy as a positive factor in deliverability prediction.

How MailEntriX Uses MX Records

During verification, MailEntriX: resolves MX records for the domain, identifies the mail server provider from MX hostnames (55+ provider patterns), checks MX server IPs against 104 DNSBL providers, detects parking or placeholder MX configurations, and uses MX redundancy in deliverability scoring.