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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