Nacha’s Operations Bulletin #2-2025 strongly recommends that all Non-Consumer Originators, Participating Depository Financial Institutions, Third-Party Service Providers and Third-Party Senders abandon the use of faxes and use only a secure electronic channel when exchanging information and documents to resolve ACH Exceptions. As an alternative to faxes, Nacha offers a secure electronic channel available to financial institutions within the Risk Management Portal for resolving many types of ACH exceptions. For example, an Originating Depository Financial Institution (ODFI) might provide a signed Letter of Indemnity (LOI) to support its request that a Receiving Depository Financial Institution (RDFI) return an ACH Credit. An RDFI can notify an ODFI about the status of a request for return using the Portal’s Return Status form, which can also be used to advise an ODFI after receiving an LOI. An RDFI can notify an ODFI that it has exercised its Exemption from Funds Availability as allowed by the Nacha Operating Rules. Finally, FIs might exchange information to resolve an IAT exception. The Risk Management Portal has evolved to serve as a channel for sensitive information that must be exchanged securely. The channel is secure even from Nacha, which cannot view, collect, or retain data or documents exchanged between parties. The Portal is also evolving to discourage the use of unsecure channels. From now on, any new categories added to the ACH Contact Registry in Nacha’s Risk Management Portal—such as Exception Resolution and Information Security contacts—will not capture fax numbers. Nacha believes phasing out support for fax numbers will steer users toward channels that provide appropriate security for the information being exchanged.