The reverse lookup for 118.189.211.120 does not match your HELO greeting and does not match the A record for exchange.teo-en-ming.com.  Get your upstream ISP to fix that.

Lyle Giese
LCR Computer Services, Inc.

On 8/13/2018 8:28 PM, Turritopsis Dohrnii Teo En Ming wrote:
Good morning from Singapore,

Previously the mail server at httpd.apache.org domain rejected all of my emails.

I have solved the problem by adding the following Sender Policy Framework (SPF) 
text (TXT) record to my DNS server:

teo-en-ming.com.       IN     TXT         "v=spf1 mx -all"

Now my Exchange server is finally able to send emails to the httpd.apache.org 
domain.

Am I an excellent troubleshooter?

However, the mail server at freebsd.org is still rejecting my emails. Adding 
SPF TXT record did not solve the problem for this domain (freebsd.org). Perhaps 
I need to configure DKIM as well? I have no idea what is DKIM.

Please help me to troubleshoot email delivery failure for the freebsd.org 
domain.

Thank you very much.
===BEGIN SIGNATURE===
Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 30 Oct 2017
[1] https://tdtemcerts.wordpress.com/
[2] http://tdtemcerts.blogspot.sg/
[3] https://www.scribd.com/user/270125049/Teo-En-Ming
===END SIGNATURE===
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