Problem with sending emails with the hostname

[JosePP]

Hello @Sandeep!

I don't know if you have, but I have different servers with CWP, from where I think they send SPAM from the server with emails of the type:

*@hostname.com

Do you know how you can prevent them from using emails that do not exist on the CWP server to send emails?

Greetings!

[sandeep]

@josepp did you checked the origin/source of the mail ?

[JosePP]

@sandeep said in Problem with sending emails with the hostname:

@josepp did you checked the origin/source of the mail ?

Hello!

The truth is that it happens in all servers CWP, so I was rather asking if you knew any general solution for the servers not to be able to send emails of this type:

root@hostname.com
users@hostname.com

Or similar.

I add: I have the php mail function disabled, we use SMTP.

[JosePP]

I add: I have the php mail function disabled, we use SMTP.

[sandeep]

@josepp hi you can add server hostname to postfix reject list in order to stop receiving from them.

Like in :

/etc/postfix/sender_access

Add one of below which fits you i.e. you don't want mail from those sans or from particular user matches the name.

domain.com                       REJECT
sub.domain.com                   REJECT
user@                            REJECT

now run postmap:

postmap /etc/postfix/sender_access

Ensure you added the reject config or present in /etc/postfix/main.cf

smtpd_recipient_restrictions = check_sender_access hash:/etc/postfix/sender_access

At last restart postfix service.