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aPendLtd
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Configure new integral Windows 2008 R2 SMTP service

Hello,
I'm using Windows Server 2008 R2 with the integral SMTP service on port 125.
This server is a Web Server that contains two websites: aaa.com and aaa.net (for example), these websites are sending emails through this service.

In addition, I have hMailServer installed on the server - hMail is using ports 25 (SMTP) and 101 (POP3) - this mail server is used for the Info \ Sales \ NoReply and some other mailboxes.

I'm using TMG FW and ports 110 \ 25 \ 80 \ 443 are opened from the world to my server.

Two big issues:
1. I need to configure the pointer - what name should I give to this pointer: aaa.com \ aaa.net or other name?
2. Some emails are being rejected when sending from both hMailServer and SMTP service - SPF is configured correctly and I'm not blacklisted. I'm getting an NDR message regarding incorrect "HELO" - can anyone put a light on this issue, how and where it should be configured?
(The message I receive is: "Remote server replied: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1")

Thanks in advance.
Email ProtocolsEmail ServersWindows Server 2008

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aPendLtd

8/22/2022 - Mon
SOLUTION
Britt Thompson

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Dave Howe

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aPendLtd

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The answers the experts gave me were very helpful, nevertheless, the solution I posted solved my problem.
I started with Experts Exchange in 2004 and it's been a mainstay of my professional computing life since. It helped me launch a career as a programmer / Oracle data analyst
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