Configuring Apple Mail with Gmail Aliases I am trying to use AppleMail and trying to configure to using gmail alias.

My primary email address is sid@mydomain.com and I have configured this in Apple Mail and able to send / receive messages properly. This primary email has an alias on my google apps for business sid-sales@mydomain.com

Whenever someone sends an email to sid-sales@mydomain.com, I receive it on sid@mydomain.com and on the Apple Mail. So far good.

Now, I want to configure Apple Mail so that I am able to send emails using both my primary email and the alias (and with different names). So, I want to have two email configurations -

- Sid &lt;sid@mydomain.com&gt;
- Sid from Sales &lt;sid-sales@mydomain.com&gt;


I am not able to get this working. I tried adding both the emails separated by a comma in the Accounts section. After doing this, both the emails appear in the From field and I can choose from one but the receiving side is always getting my email from my primary email address. So, if I choose sid-sales@mydomain.com in the From field, the receiver still sees sid@mydomain.com

I also tried changing the plist file by adding EmailAliases - I was able to change the Name but the email address is still sid@mydomain.com

Can somebody please help me with this? I tried searching a lot on the internet but I am not able to find anything which will solve the problem.
None of the other solutions worked for me right now with Apple Mail 9.3 on OS X 10.11.4. Just to make sure, my situation is as follows:


I have a primary email address xyz@somedomain.com as a Google Apps account
I added a domain alias otherdomain.com to that account
I want to send from xyz@otherdomain.com and have the receiver see this in the "from:" field (notice that this is slightly more complicated than in the original question, but includes the original question's case!)


After a lot of experimenting, this did work (both parts required, it seems).


On the Gmail end: 


For the primary email address xyz@somedomain.com, I went to Gmail online, then (under the top right tool icon) Settings > Account.
There I clicked: "Add another email address you own".
In the window popping up, I entered my (same) name and, under "Email address", the full alternative xyz@otherdomain.com
I left "Treat as an alias." unchecked.
Clicking the "Next step>>" button, I left the default top selection (the one that says "easier to set up")
I saved this.
(Back in the main Accounts screen, I checked "Reply from the same address the message was sent to", but that doesn't seem to be relevant to the root problem we are trying to solve here)



Using "Compose" still in Gmail online, I was able to change the from field to xyz@otherdomain.com and confirm that the receiver saw this as the "from:" field (as well as in the raw mail data).


Now in Mail, in the settings for xyz@somedomain.com I just added an alias in the "Alias:" field right under "Description:". Now Mail shows the alternative email address in the From field when composing emails in Mail, too, and the recipient sees xyz@otherdomain.com as the true sender (checked in the raw mail data again).


Notice that without the Gmail modification from Step 1, adding an alias to Mail just resulted in an additional line "X-Google-Original-From: xyz@otherdomain.com", which Mail wouldn't recognize as a sender in any form.