Enable possibility to send e-mails from other domains (use case: external users

Use Case:
In our Maximo environment we collaborate with external users (suppliers, customers). However, the current setup does not allow those external users to send outbound e-mails from Maximo (create communication, scheduled reports). Those external users have a e-mail address which is obviously not a valid domain (e.g. not @mybusiness.com).

Problem Statement
With the current Maximo design limitations we run into spoofing issues. When external usersschedule a report or send a communication those e-mails are send using the primary e-mail address. As those users do not have a valid domain e-mail address these e-mails are blocked by the SMTP server. This is causing issues (blocked e-mails, queues, non-processed e-mails) in the e-mail environment. Our partner Microsoft does not accept such spoofing.

In my opinion it is a bug that there is a spoofing option in Maximo that cannot be prevented at this moment. Allowing such e-mails from a domain which you are not or which you do not belong to could get you blacklisted by the recipient. Besides e-mail providers (like Microsoft) also actively monitors for this undesired behavior.

Solution Proposal
There should be an option to whitelist a certain domain or multiple domains and that all other e-mails send from other domains can be 'overruled' and send from a standard e-mail address (e.g. maximo@mybusiness.com). Therefore we want to propose the idea to introduce a feature that allows administrators to:

1. Define in one property the supported domains (e.g. @mybusiness.com, @mybusiness.nl, etc.) using a comma separated list.

2. Define in second property a default 'send from' e-mail address that is applied in case the e-mail is send from a different domain then the supported domains

If these properties are enabled Maximo should validate each outbound e-mail before sending it to the SMTP server. It should replace the 'sendfrom' e-mail header with the e-mail address as defined in property #2 in case the e-mailaddress domain of the person which is sending the e-mail does not match one of the supported domains (as defined in property #1).

Additional remarks
A similar idea was proposed before: https://ideas.ibm.com/ideas/MASM-I-466

However, based on the response from IBM I believe that the idea was not properly understood by the IBM representative as in the response they mention the e-mail listener which is used for reading/processing inbound e-mails towards Maximo whereas the idea is clearly about outbound e-mails and replacing headers of those outbound e-mails.