Brandon,
Typically speaking I would recommend an authenticated SMTP Proxy. This would allow you complete flexibility in sending from Epicor. Option 3 on the link below. It can be a little confusing to get setup but once its working it makes life so much easier.
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I want to play with this in my quest to create an E365 for my O365 users:
https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/resources/mail_api_overview
Microsoft services have been REST-enabled for a bit now. (Worst name ever BTW…)
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Hmm so I went back and re-read the actual documentation they have there and its less complete than I thought. I will try to do a basic write up on this tomorrow morning for the community. I used to work for an MSP and this is what I setup for EVERY company that had an LOB like Epicor for sending emails. I’ve done it so many times that I thought that document was more complete than it is. Sorry about that.
Is there still an option to change the REPLY TO address in emails? if so, isn’t that all you really want?
OR you could give the generic epicor email address delegate authority in you email system? Allow someone else to manage your mail and calendar - Microsoft Support
There is, but I sent some tests, and it didn’t seem to do anything. That was going to be one of my questions.
I saw that article, and maybe that would work too.
edit: I tried setting that up, and it looks like the delegate only works from the outlook client. Trying to auto-send stuff through Epicor doesn’t seem to work.
I can say for certain that what @josecgomez posted about using groups is very easy and works well. While the relay might be the best answer the setup of a group and adding your authenticated user in the Epicor company configuration to the SEND AS permissions works great. We use this on quite a few installs, that have limited infrastructure capabilities,
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So I tried just the individual user delegate. That must work different then the group then?
Don’t quote me on this but I believe the behavior is a little different. I have setup SEND AS with users but typically that is from the Outlook Web or Outlook so not sure it works the same and I avoid using users for this for cost reasons. Try a group and see if that works for you.
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Did you ever get around to doing a basic write up for this process? I am interested on how you got Epicor to play nicely with alternate email addresses.
Crap. No I did not. Thank you for brining it up. I will tackle tomorrow.
No worries.
Looking forward to your insight. 
HAHA Oh boy… One Sec. Ill write it up quick. (Busy little beaver here with a project)
Please read this carefully and pay attention to the warning at the bottom. I did this entire thing from memory and its been a while since I have set one up but I am pretty sure I got everything. Let me know if you have any issues and if it works well for you please give credit where its due 
Install IIS 6.0 on a Windows Server in your network. IIRC you also need to enable SMTP Server manually. 
Once these are installed then (you may have to reboot) you should open IIS 6.0 Admin Console 
This name doesn’t really matter THAT much. Just something descriptive.
Depending on your environment pick the IP you want to use. MOST deployments will just be ‘All Unassigned’
I usually make a directory right in C:\inetpub<DESCNAME>
DO NOT put your actual email domain here. That would cause this SMTP service to try to accept the mail itself. Generally I put my .LOCAL domain in. e10help.local for example.
Right Click and open the Properties for the newly built Email Service.
On the Access Tab Click ‘Connection’ and make sure ‘All Except’ is the chosen option’
Then click ‘Relay’, select ‘Only the list below’ and add the servers that you EXPECT you receive email from. BE 100% SURE YOU ARE SECURING THIS AS ANY EMAIL WILL BE RELAYED.
Next on the ‘Delivery’ Tab click ‘Outbound Security’ make sure that ‘Anonymous access’ is selected and ‘TLS’ is disabled.
Click ‘Outbound Connections’ and set the port to 25.
Then on ‘Advanced’ set a local ID for the FQDN ‘in the case of this server it would be apps.epiusers.help.
Then for the smart host you need the MX record that Office 365 gives you.
That is it for the Server side of things. Next we need to setup a receive connector in Office 365. You need your external IP address (http://ipquail.com). Login to Office 365 as an Exchange Admin. Head into the Exchange Admin for your Tenant. Then ‘Mail Flow’ and ‘Connectors’
Add a new connector. Select From: ‘Your organizations email server’ and To: ‘Office 365’ Click Next
Give it a name. Leave the two check boxes enabled. Click Next
Select the second radio button and add your WAN IP address. (Obviously 8.8.8.8 here is an example because I don’t trust people ) Click Next
Now Save it.
That’s really it. Now if you point Epicor email sending at port 25 on the server IP locally in your network it should be able to send as ANY address with your domain name as the “@epiusers.help” section. FINALLY AND MOST IMPORTANTLY PLEASE PLEASE PLEASE make sure you block anything else in your network from sending out via port 25. You should do this anyway but If you set this up and I knew about it as a user I could masquerade as any person in the internal domain and send whatever I want.
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Now that’s some awesome stuff right there. Moving to Experts’ Corner
I’ll admit, this was post was #TLDR but… A super easy way to do this just buy an SMTP service, then use code mailer (not the built in). You can modify the message any way you want, Change the display name, change the reply to, hell, if your service allows it, set the from address to anything you want.
I am sure a more versed IT person can give plenty reasons why you shouldnt do this.
Thats what this does. For free (within the scope of your Office 365). We use it for Epicor, APM, internal web service alerts. It will work with any system that does SMTP.
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Awesome! Thanks for the detailed write-up.
I was wondering where this went as I didn’t see it in my notifications for some reason.
My issue was putting in the email domain instead of local domain in that step above.
And thus we see one of the many benefits of reading 