correct the entry in your address book, I would guess for your friend that has the same email address.

I deleted my friends email name and address from the address book. I'll wait and see if this takes care of the issue. I'll know when I receive a new email from the business. Thanks

In addition to Matt's insightful suggestion, I'd also look at the message headers or source (ctrl+u) to see what's being inserted into the message. It's possible the sender is doing something inappropriate.

Zenos said

In addition to Matt's insightful suggestion, I'd also look at the message headers or source (ctrl+u) to see what's being inserted into the message. It's possible the sender is doing something inappropriate.

Thanks Zenos, that's what I initially thought when I contacted the sender. I'm sure the sender at the business is not that tech savvy. After looking at the source (ctrl+u), I think it may be on my end. I'll know for sure if the address book was the issue, after I receive an email from the business.

Here's what I got after the deletion of both my friends email and the business email.

The business email now has: From: xxx@activenetwork.com Reply to: yyy@cornerstoneonline.com

My friends email now has: From: xxx@activenetwork.com Reply to: aaa@cornerstoneonline.com

My friend actually works at this company and his email really is the aaa@cornerstoneonline.com, not xxx@activenetwork.com

Same with the business, their correct email is yyy@cornerstoneonline.com and not xxx@activenetwork.com.

xxx@activenetwork.com does not exist in my address book.

Any ideas?

I suspect that activenetwork.com is the actual provisioner of the email service used by cornerstoneonline.com and there is a misconfigured server or MX record somewhere that is failing to substitute the appropriate from: address.

The reply-to: looks like a ham-fisted attempt to get replies to go back to the preferred account, but they don't help you as all the from: addresses are incorrect.

Now, cornerstoneonline.com appears to be a church-related organization:

Domain Name: CORNERSTONEONLINE.COM
…
Registrar WHOIS Server: whois.godaddy.com
Registrar URL: http://www.godaddy.com
…
Admin Organization: Cornerstone Christian Fellowshiip

(from their whois record)

and activenetworks.com provides "software for the unique needs of your church"

http://www.fellowshipone.com/features

So it would appear that cornerstone buy some services from activenetworks, (including email) and this appears in the originating address. Ideally it would be aliased to an email address on the cornerstoneonline.com domain.

I suspect that someone at cornerstone has misconfigured settings at godaddy.com, from whence they appear to purchased the cornerstoneonline.com domain.

Zenos said

I suspect that activenetwork.com is the actual provisioner of the email service used by cornerstoneonline.com and there is a misconfigured server or MX record somewhere that is failing to substitute the appropriate from: address. The reply-to: looks like a ham-fisted attempt to get replies to go back to the preferred account, but they don't help you as all the from: addresses are incorrect. Now, cornerstoneonline.com appears to be a church-related organization: Domain Name: CORNERSTONEONLINE.COM … Registrar WHOIS Server: whois.godaddy.com Registrar URL: http://www.godaddy.com … Admin Organization: Cornerstone Christian Fellowshiip (from their whois record) and activenetworks.com provides "software for the unique needs of your church" http://www.fellowshipone.com/features So it would appear that cornerstone buy some services from activenetworks, (including email) and this appears in the originating address. Ideally it would be aliased to an email address on the cornerstoneonline.com domain. I suspect that someone at cornerstone has misconfigured settings at godaddy.com, from whence they appear to purchased the cornerstoneonline.com domain.

Thanks Zenos, I'll notify them about the information you gave me.