why email alias not working in iphone after upgrade to iOS 10

      Some users have been complaining that Prior to iOS 10, when adding a Gmail account, they could set up an alias for that account (different appearing name for messages). At first look it seems that  iOS 10 seems to offer way fewer settings, and no way that I can see to set up aliases. All items I want to send via email from my phone are sent only from my primary address. Not from "sales@" or "tech@" which are aliases. Makes apple iOS mail app unusable.

When users try to send the email with alias receives all emails but cannot reply to any of them, all message they just sit in the outbox if you try to use alias.

To fix the alias exchange issue in iphone and iOS 10, is to set up your Gmail account in iOS as a manually-added IMAP account, NOT by selecting Google in the add account screen. After it's set up you go back in and add another email address. Done. Now you should be able to create alias.

How to manually Set up an email account on your iPhone, iPad, or iPod touch:

Set up an account manually

Make sure that you know your email settings. If you don’t know them, you can look them up or contact your email provider. Then follow these steps:

1.   Tap Add Account, tap Other, then tap Add Mail Account.

2.    Enter your name, email address, password, and a description for your account.

3.    Tap Next. Mail will try to find the email settings and finish your account setup. If Mail finds your email settings, tap Done to complete your account setup.

If Mail can’t find your email settings, you need to enter them manually. After you enter your email address and password, tap Next, then follow these steps:

1.     Choose IMAP or POP for your new account. If you aren’t sure which one to choose, contact your email provider.

2.     Enter the information for Incoming Mail Server and Outgoing Mail      Server. Then tap Next. If you don't have this information, try to look it up or contact your email provider.

3.     If your email settings are correct, tap Save to finish. If the email settings are incorrect, you'll be asked to edit them.

If you still can't set up your email account or save your email settings, contact your email provider.