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add the ip address to the hosts.allow (or sendmail.cf) file and restart
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add the ip address to the hosts.allow (or sendmail.cf) file and restart

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Can you use a network (i.e. 145.23.45.0/24)?
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Can you use a network (i.e. 145.23.45.0/24)?

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needed to add record to hosts.deny as well.
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needed to add record to hosts.deny as well.

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<div class="content wysiwyg-content">
I am having a great amount of spam coming through these days and I noticed this in the sendmail log file:<br />
<br />
from=&lt;&gt;, size=0, class=0, nrcpts=1, proto=SMTP, daemon=MTA<br />
<br />
Also, how can you configure sendmail to only allow SMTP connections from 1 host/ip?
</div>
</div>


I am having a great amount of spam coming through these days and I noticed this in the sendmail log file:

from=<>, size=0, class=0, nrcpts=1, proto=SMTP, daemon=MTA

Also, how can you configure sendmail to only allow SMTP connections from 1 host/ip?

Sendmail - Stange from address in log

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

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.

Email Software

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.