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SPF/origination details needed for e-mailed receipts from

When we use the receipt option in which e-mails the receipt to the customer and our e-mail address is inserted by as the sender of the e-mail even though is the actual originator of the e-mail, we need to know the exact and complete list of domain names and/or IP addresses from which will actually be sending the receipt e-mails so that these domains/IPs can be whitelisted in our SPF records to help confirm the authenticity of the e-mails.  Where can we find this information, or is the originator guaranteed to always simply be ""?


Hello @karenb 


Emails sent to Merchants and Customers from Authorize.Net originate from, and



Administrator Administrator

Hi, I hope it's okay to post this question here. We support a client who uses and Office 365 as their email service. 

We've added the IPs you noted above but we're still receiving bounce messages when attempts to email a receipt to a customer. 

Here is the SPF record we're using: 


v=spf1 ip4: ip4: -all


Are there other IPs sends from? Have they changed recently? Thanks in advance for a reponse.