MX レコード検索
ドメインのメールサーバーと優先度を調べ、Google Workspace / Microsoft 365 / Mailgun などの設定を検証できます。
AK
appkiro.comFind MX records and priorities for a domain before configuring or troubleshooting email delivery.
MX Lookup is the quick check I use when an email domain looks correct on the surface but messages are bouncing, delayed, or going to the wrong provider. It shows which mail servers the domain asks the internet to use.
Enter the part after the @ sign. For [email protected], check example.com. The result lists mail exchanger hosts and their priority values.
Lower priority numbers are tried first. If you see several MX records, that is usually normal: one server may be primary and the others may be backups. What looks suspicious is a mix of old and new providers after a migration.
Compare the MX hosts shown here with the values from Google Workspace, Microsoft 365, Zoho, your hosting panel, or whichever provider should receive the mail. If the old provider still appears, the DNS change may not be complete yet.
CLI equivalent
dig example.com MXNetwork checks run from the app server, so results reflect what is reachable from that public environment. Localhost, private IPs, and internal-only targets are blocked.
It tells other mail servers where to deliver email for the domain. The record includes a mail server hostname and a priority number.
Usually example.com. You are checking the domain that receives email, not necessarily the hostname of the mail server.
That is common. Multiple records can provide failover or route mail through a provider cluster. The lower priority number is preferred first.
Some systems may fall back to A or AAAA records, but it is not something to rely on. A properly configured mail domain should publish MX records.