<div>
Yes you are right<br />
<br />
<br />
order is this:<br />
<br />
1. Allow the connection if it matches a line in hosts.allow. End.<br />
<br />
2. Deny the connection if it maches a ling in hosts.deny. End.<br />
<br />
3. Allow the connection.<br />
<br />
Since the default is to allow any connection that doesn't match,
</div>


Yes you are right


order is this:

1. Allow the connection if it matches a line in hosts.allow. End.

2. Deny the connection if it maches a ling in hosts.deny. End.

3. Allow the connection.

Since the default is to allow any connection that doesn't match,

<div>
But will the ALL override the sendmail. Do you mean that when it saw sendmail in host.allow with the IP, then it will not check host.deny ?
</div>


But will the ALL override the sendmail. Do you mean that when it saw sendmail in host.allow with the IP, then it will not check host.deny ?

<div>
And I should use &quot;sendmail&quot; and not &quot;email&quot; or something like that ? 
</div>


And I should use "sendmail" and not "email" or something like that ?

<div>
--------/etc/hosts.allow--<wbr />------<br />
ALL : attack_ip : DENY<br />
sendmail : attack_ip : DENY<br />
smtp : attack_ip : DENY<br />
<br />
please check this
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--------/etc/hosts.allow--------
ALL : attack_ip : DENY
sendmail : attack_ip : DENY
smtp : attack_ip : DENY

please check this

<div>
I agree with ssvl. The allow is parsed before deny. Also just put a sendmail allow and not smtp as it is handled by the sendmail daemon.
</div>


I agree with ssvl. The allow is parsed before deny. Also just put a sendmail allow and not smtp as it is handled by the sendmail daemon.

<div>
<div class="content wysiwyg-content">
I want to refuse a whole set of IP from all services except sending email to us.<br />
eg. IP 89.<br />
In the host.allow file :<br />
sendmail: 89.<br />
<br />
In the host.deny file:<br />
ALL: 89.<br />
<br />
Is this correct ? <br />
<br />

</div>
</div>


I want to refuse a whole set of IP from all services except sending email to us.
eg. IP 89.
In the host.allow file :
sendmail: 89.

In the host.deny file:
ALL: 89.

Is this correct ? 



Host.Allow, Host.Deny

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.