If you have purchased the HEAT Cloud Email product and use a @saasit.com, @saasiteu.com or @saasitau.com address to send/receive emails, on your receiving email server(s)/SPAM filters you may want to whitelist the IP address ranges used for sending.
This applies when your Email Config settings use an Outgoing server SMTP host from the emailsrvr.com domain (e.g. secure.emailsrvr.com)
Here are the IP addresses used for sending email from HEAT Cloud when using a HEAT Cloud Hosted Email account:
List last verified: 2017-05-24