Block email usage

At alwaysdata, DNS management is done in the menu Domains > Details of [example.org]- ⚙️ > DNS Records.

MX, SPF, and DMARC DNS records are created by default; adding these types of records will override the records created by the system.

Blocking Receiving Emails

Simply do NOT create an email address with your email provider and/or add a MX record with your DNS provider that points to a non-existent value. Senders will receive an error.

You can, for example, create the following record:

TypeHostnameValuePriority
MX[leave blank or @ depending on the DNS provider]/dev/null1

Block Sendings

The aim here is to prevent hackers from impersonating you by sending emails with your domain in the FROM address.

Create the following DNS records:

TypeHostnameValue
TXT[leave blank or @ depending on the DNS provider]v=spf1 -all
TXT_dmarcv=DMARC1; p=reject;

This will tell recipient email servers using your domain to reject emails. Indeed:

  • The SPF record indicates that there are no SMTP servers authorized to send emails for your domain,
  • The DMARC record indicates that all emails sent from your domain should therefore be discarded.