How to block mail for whole domain
To block mail for a whole domain, you can use various methods depending on your email provider or mail server configuration. Here are a few approaches:
Method 1: DNS-based blocking (SPF and DKIM)
- Set up a Sender Policy Framework (SPF) record for your domain. This record specifies which mail servers are authorized to send emails on behalf of your domain.
- Set up DomainKeys Identified Mail (DKIM) for your domain. This record authenticates the sender of an email by verifying a digital signature.
- Configure your mail server to include the SPF and DKIM records in the headers of outgoing emails.
Method 2: Mail server configuration (e.g., Postfix, Sendmail, Exim)
- Edit your mail server's configuration file (e.g.,
/etc/postfix/main.cf
for Postfix). - Add a rule to block emails from a specific domain. For example, you can add a
smtpd_recipient_restrictions
directive to block emails fromexample.com
:smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/recipient_access, reject_sender_login_mismatch, reject_non_fqdn_sender, reject_unknown_sender_domain, reject_rbl_client spamhaus.org, reject_rbl_client bl.spamcop.net, check_recipient_access pcre:/etc/postfix/recipient_access_pcre
- Create a new file (e.g.,
/etc/postfix/recipient_access
) with the following contents:example.com REJECT
- Restart your mail server to apply the changes.
Method 3: Email client or webmail configuration
- If you're using an email client (e.g., Microsoft Outlook, Mozilla Thunderbird), you can set up a filter to block emails from a specific domain.
- If you're using a webmail service (e.g., Gmail, Yahoo Mail), you can set up a filter to block emails from a specific domain.
Example: Gmail filter
- Log in to your Gmail account.
- Click on the gear icon and select "See all settings."
- Go to the "Filters and Blocked Addresses" tab.
- Click on "Create a new filter."
- Enter the domain you want to block (e.g.,
example.com
) in the "From" field. - Select "Delete it" as the action.
- Click "Create" to save the filter.
Remember to test your blocking configuration to ensure it's working as expected.