On 14.08.18 07:50, Lyle Giese wrote:
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.
and does not match the A record for
exchange.teo-en-ming.com.
neither does this one.
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
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.
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