If you use Actionstep's SMTP servers to send email, you must register these IP addresses in the Sender Policy Framework (or SPF) settings of your DNS configuration to prevent your outgoing emails being marked as spam.
Update your SPF or Sender-ID record to include the following:
v=spf1 a mx ptr include:_spf.actionstep.com ~all
If you already have an existing SPF record, simply amend it with:
include:_spf.actionstep.com
If your SPF record contains an "~all" , make sure the addition is before the all. The "~all" should always be at the end.
Additional Resources:
Updated