Discussion:
[SOLVED] My Exchange server is now able to send email to httpd.apache.org domain after I added SPF TXT record to my DNS server
Turritopsis Dohrnii Teo En Ming
2018-08-14 01:28:46 UTC
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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.


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Lyle Giese
2018-08-14 12:50:21 UTC
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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.
Post by Turritopsis Dohrnii Teo En Ming
Good morning from Singapore,
Previously the mail server at httpd.apache.org domain rejected all of my emails.
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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Matus UHLAR - fantomas
2018-08-14 18:15:18 UTC
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Post by Lyle Giese
The reverse lookup for 118.189.211.120 does not match your HELO
greeting
this does not matter much.
The HELO string exchange.teo-en-ming.com does exist, which is good.
Post by Lyle Giese
and does not match the A record for
exchange.teo-en-ming.com.
neither does this one.
Post by Lyle Giese
Get your upstream ISP to fix that.
this is the first and biggest problem, the reverse lookup points to non-existing host
name:

120.211.189.118.in-addr.arpa domain name pointer 120.211.189.118.static.m1net.com.sg.
Host 120.211.189.118.static.m1net.com.sg. not found: 3(NXDOMAIN)

The second is that the reverse and matching forward (points back to
118.189.211.120) should not be generic.

Yes, ISP pointing the reverse to exchange.teo-en-ming.com would be best
solution.


Btw, the OP should get second nameserver in different netwotk:

;; AUTHORITY SECTION:
teo-en-ming.com. 112671 IN NS ns1.teo-en-ming.com.
teo-en-ming.com. 112671 IN NS ns2.teo-en-ming.com.

;; ADDITIONAL SECTION:
ns1.teo-en-ming.com. 3475 IN A 118.189.211.120
ns2.teo-en-ming.com. 3475 IN A 118.189.211.120
Post by Lyle Giese
Post by Turritopsis Dohrnii Teo En Ming
Good morning from Singapore,
Previously the mail server at httpd.apache.org domain rejected all of my emails.
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.
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