Block mails going to an address from my domain
To block emails going to a specific address from your domain, you can use a combination of DNS records and email server settings. Here are the steps:
Step 1: Create a DNS record
Create a TXT record in your DNS settings with the following format:
@ IN TXT "v=spf1 a mx ptr include:_spf.google.com ~all"
This record is called a Sender Policy Framework (SPF) record, and it helps prevent spam by specifying which mail servers are authorized to send emails from your domain.
Step 2: Create a DMARC record
Create a TXT record in your DNS settings with the following format:
@ IN TXT "v=DMARC1; p=reject; sp=none; pct=100; ruf=mailto:[email protected]"
This record is called a Domain-based Message Authentication, Reporting, and Conformance (DMARC) record, and it helps prevent email spoofing by specifying how to handle emails that fail authentication.
Step 3: Configure your email server
Configure your email server to reject emails sent to the specific address you want to block. The exact steps will depend on your email server software and configuration.
For example, if you're using Postfix, you can add the following lines to your /etc/postfix/main.cf
file:
smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/recipient_access
recipient_access = reject: [email protected]
Then, create a file /etc/postfix/recipient_access
with the following contents:
[email protected] REJECT
Step 4: Update your DNS records
Update your DNS records to reflect the changes you made in Steps 1 and 2.
Step 5: Test your setup
Test your setup by sending an email to the blocked address from an external email account. The email should be rejected by your email server.
Note: These steps are just a general guide, and the specific configuration may vary depending on your email server software, DNS provider, and domain configuration. It's also important to test your setup thoroughly to ensure that it's working as expected.
Additionally, you can also use other methods to block emails, such as:
- Using a firewall to block incoming emails on a specific port
- Configuring your email server to reject emails with specific headers or content
- Using a third-party email filtering service to block emails
It's also important to note that blocking emails can have unintended consequences, such as preventing legitimate emails from being delivered. Therefore, it's important to carefully consider the impact of blocking emails and to test your setup thoroughly before implementing it.