MX Lookup
Look up the mail exchange records for any domain and analyze its mail servers and priority values.
An MX (Mail Exchange) record specifies which mail server incoming email for a domain should be delivered to. A domain without MX records cannot receive email. Each MX record carries a priority value; servers are tried in priority order.
MX records ensure incoming emails reach the correct mail server. Without this record, no one can send email to your domain.
Defining multiple MX records creates redundancy. When the primary server is unreachable, email is automatically routed to the next lower-priority server.
An MX lookup instantly reveals which email service a domain uses — Google Workspace, Microsoft 365, Pro ePosta, or any other provider.
MX records are added through your domain's DNS management panel. Your email provider will supply the necessary MX addresses and priority values.
Find the MX server addresses and priority values in your email provider's documentation (Pro ePosta, Google Workspace, Microsoft 365, etc.).
10 mail.proeposta.com
20 mail2.proeposta.com
In your DNS management panel, create a new MX record. Enter @ in the host field, the mail server hostname as the value, and the numeric priority. Add each MX record separately if you have more than one.
After DNS propagation (5–30 minutes), use the lookup tool above to verify your MX records. Once the servers and priorities look correct, send a test email to confirm delivery.
Key points to maximise email deliverability and keep your mail infrastructure reliable.
MX priority is expressed numerically and lower number = higher preference. Assign 10 to your primary server and 20 to the backup. Having all MX records at the same value is not recommended.
MX record values must always be a hostname (e.g. mail.proeposta.com); you cannot use a bare IP address. Make sure the hostname has a corresponding A record.
Add at least one secondary MX server so email is queued — not lost — if your primary server is temporarily unreachable. The backup holds the messages and delivers them once the primary comes back online.
If your SPF record uses the mx mechanism, your MX servers are also authorised to send email. When you change MX records, review your SPF record to ensure it stays accurate.
Switch to Pro ePosta's business email hosting for high deliverability, multi-layer spam protection, and 24/7 monitoring.
