Sending email from different addresses under one account.

Question

Hello,
So, I'm having an issue that's a little bit complicated, and in fact, I don't even know if there is a solution.  But, if anyone knows how to do this, I'd greatly appreciatte your help.
So, here's what I'm trying to do.
Right now, I have three different email accounts, an icloud and two gmails.  I have both of those gmails set up so that they forward to my icloud account.  So, in the mail app on my iphone, I only have my icloud account.  I've been trying to reduce clutter by doing this, and it seems to be working pretty well, save for this issue.
The problem I am having is still being able to respond to emails sent to one of those two gmail accounts with the same email address.  I.e.-if someone emails me at my gmail account, it's then forwarded to icloud, but I still want to respond from that gmail account using the mail app on my iphone.  I'd like to do this without setting adding the two "dead" gmail accounts onto my phone, because everything is more streamlined when I'm only using icloud.
I've been able to do this using iMail on my mac by adding the two gmail addresses to my icloud account in settings, as well as the gmail server.  So on my mac, I only have icloud set up in imail, but I can compose emails using my two gmail addresses.  I pretty much want to be able to do the same thing on my iphone.
Does anyone know how this can, or even if, it can be set up?
Also, if it can't be done in the native mail app to ios, do you know of any third party apps where something like this would be possible?
Thanks!!1

Answer 1

Hi 3s1k,
Thank you for your question.
When he replies to my email and changes the "send From" 
to [email protected] and send the email, It will still show that it was sent from @mainDomain.com.
Now, I think the issue is within his Exchange mailbox, his default reply email address is @MainDomain.com.
A:You are right. By our testing. We could just send emails with primary address, but we could receive emails with primary address and second address.
How do I get around this. The client wants to utilize sending email from both domains since he has clients in both domains.
A: If we want to send email with specific email address, we could manually modify the primary email address to the specific domain by Exchange administrator. And the client didn’t use customized email address to send emails.
If there are any questions regarding this issue, please be free to let me know. 
Best Regard,
Jim