When you email something from OLR your email address is “spoofed” by our server so that appears to be coming from your company email account (and not @olr.com).
This spoofing may add to the probability that the email will be caught by the recipients spam / junk filters. To minimize this, your company can add a Sender Policy Framework (SPF) record to their Domain Name Service (DNS) record.
If the following line is added to your company's DNS record your email is more likely to be received:
v=spf1 ip4:220.127.116.11/29 –all
The purpose of a SPF record is to prevent spammers from sending messages with forged addresses from your domain. Recipients can refer to the SPF record to determine whether a message purporting to be from your domain comes from an authorized mail server.
Here is link explaining a SPF record and instruction on how to add one to your DNS.