As you know, NowCerts sends a lot of emails on your behalf (certificates, documents, forms, etc.) through your email accounts via SMTP. These kinds of emails can often be interpreted as spam or hacks/viruses by recipient email servers. As a result, you may see an increased number of undelivered emails, known as "bounce-backs." Recently, there has been a push to find a solution that separates genuine emails from spam. http://www.openspf.org/
Luckily, there is a simple solution to avoiding bounce-backs. Follow these instructions:
You need to contact your email administrator and ask them to add the following TXT/SPF records to your DNS Zone file. This is what your SPF record needs to look like:
Put this in the TXT field: “v=spf1 mx include:nowcerts.
Or, if they need the IP addresses, ask your email admin to add:
IP Address: 18.104.22.168, 22.214.171.124, 126.96.36.199, and 188.8.131.52
Now, this is not something that must be done, but we highly recommend it, especially if you are getting bounce-backs. These settings will help ensure that all of your emails delivered by the NowCerts system get delivered successfully.
Here are a couple of other helpful tools for you to use:
SPF Builder wizard: https://www.spfwizard.net/
MX record look up: https://mxtoolbox.com/SuperTool.aspx