https://community.checkpoint.com/t5/Firewall-and-Security-Management/MTA-authenticate-local-domain-senders/m-p/128011#M18603 <P>hello team,&nbsp;</P><P>I have MTA enabled on a security gateway and i need&nbsp; that inbound emails, coming from&nbsp;@localdomain with destination @localdomain, to do smtp authentication to verify the sender is valid so no spam is&nbsp; sent to internal email users.</P><P>best regards.</P> Wed, 25 Aug 2021 20:34:14 GMT cespinoza 2021-08-25T20:34:14Z https://community.checkpoint.com/t5/Firewall-and-Security-Management/MTA-authenticate-local-domain-senders/m-p/128011#M18603 <P>hello team,&nbsp;</P><P>I have MTA enabled on a security gateway and i need&nbsp; that inbound emails, coming from&nbsp;@localdomain with destination @localdomain, to do smtp authentication to verify the sender is valid so no spam is&nbsp; sent to internal email users.</P><P>best regards.</P> Wed, 25 Aug 2021 20:34:14 GMT https://community.checkpoint.com/t5/Firewall-and-Security-Management/MTA-authenticate-local-domain-senders/m-p/128011#M18603 cespinoza 2021-08-25T20:34:14Z https://community.checkpoint.com/t5/Firewall-and-Security-Management/MTA-authenticate-local-domain-senders/m-p/128017#M18605 <P>Our MTA is primarily for Threat Prevention.<BR />That said, we are using Postfix under the hood, and I presume you can modify the configuration to support this.<BR /><A href="https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&amp;solutionid=sk101870" target="_blank">https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&amp;solutionid=sk101870</A>&nbsp;</P> Wed, 25 Aug 2021 21:49:03 GMT https://community.checkpoint.com/t5/Firewall-and-Security-Management/MTA-authenticate-local-domain-senders/m-p/128017#M18605 PhoneBoy 2021-08-25T21:49:03Z