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Do ISPs block domains that don't have an SPF record?

M

Mr N8

Diamond Member
I'm having some issues lately with our exchange server that I haven't been able to come up with an answer on them. I ran a report at dnsreport.com and the two things that I think could be issue are that there is no "abuse@domain.org" and we don't have an SPF record published.

Anyone who sends mail from our domain to a Road Runner email gets a delay message, and then an SMTP error message from Road Runner. Anyone with a Comcast address that sends mail to us gets this message: "The following addresses had fatal errors:
person@domain.org: 550 [PERMFAIL] destination not valid within DNS"

Are there any email experts here that can shed some light on these issues?

 
if you're talking about mailhosts not accepting mail from a server that doesn't have a reverse pointer record (like IP address to host name) then that is pretty common.
 
I am using SBC for an ISP. The exchange server is on a T1 to SBC's network and it does have a static public IP.
 
I found this, it might be the same thing you are experiencing.

is your exchange server set up as an open relay? that is a big red flag to not accept mail if that is the case...
 
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