Re: Relay mails from unknow networks/doma ins to a service provider for a récipient of m y domain.
- Huby franck wrote:
> Hi list,First, Don't accept mail "from outside" on your postfix server - for anything
> I encountered this problem :
> Some spam is sent to the recipients of our domain directly through our
> postfix server (by smtp).
> Actually the MX's of our domain are directed to the servers of a
> provider that purge spam and viruses from mail sent to our domain's
> We have a postfix server for serving mail into our domain and for
> outgoing mail.
> Every mail sent to *@... will be relayed by the server of a
> provider not by our postfix server even else for our internal users.
> relaying of our provider is made through our postfix server.
> Sometimes spam is sent directly via our postfix server and do not relay
> by our provider (in the dns MX).
> Is there a possibility to redirect (or relaying) mails sent directly (by
> smtp from external unknow network) to our postfix server and to an user
> of our domain to the server of our provider (who will relay or not
> depends of spam/viruses contains) and keep our internal and outgoing
> mail through our postfix ?
but your ISP's mailservers.
And second, don't name your mail host 'mail.yourdomain.tld' - something like
smarthost, or smtp, or relay will be better (IMHO ofcourse).
The thing is: some spammers are so stupid/lazy to a level when they don't
want (or can't?) write a program to perform a DNS query.. And just tries
to lookup an IP address of mail.$targetdomain. In your case it succeeds.
And 3rd. Don't expose mail.yourdomain.tld anywhere in email addresses --
set myorigin in postfix to yourdomain.tld (w/o the mail. prefix).
> By advance thanks to all