To allow Benchmark to send email campaigns on your behalf you will have to create or add the following SPF entry in your DNS:
If you don't already have an SPF record, you will have to create one that looks like this:

v=spf1 include:bmsend.com ~all

If you already have one, you will just have to add the include to your current record ie. just the following part:

include:bmsend.com 

For more information on SPF for Benchamark please click on the button below.

To authenticate your Benchmark email campaigns using DKIM, you will have to create the following CNAME record in DNS.

Host: bmdeda._domainkey
Points to: bmdeda._domainkey.bmsend.com
TTL: 3600

For more information on DKIM for Benchmark please click on the button below.

Create a free OnDMARC account to test your configuration.