Use custom domain in Gmail OS X and IOS

Here’s info on how to send email from your domain rather than @gmail.com, @youremailclient.com. It looks much more professional and it’s not hard. Comment below if you have more questions, these are two separate articles I found on the topic.

In Gmail

see instructions from google here or check it out below.

Gmail or Google Apps user sending from an external address:

• Click the gear in the top right .
• Select Settings.

1. Click the Accounts and Import tab.
2. Under Send mail as, click Add another email address.
3. In the ‘Email address’ field, enter your name and alternate email address you own.
4. Enter the SMTP server (e.g. smtp.domain.com), your username on that domain, and your password for that account. You may also need to adjust your port setting or SSL setting (talk to your other ISP if you need this information).
5. Click Add account >>
6. Open your other account and either click the link in the message Gmail sent or enter the confirmation code in the Accounts and Import section of your Gmail settings.
   • If Gmail sent a verification email and you didn’t receive it, try checking your Spam or Bulk Mail folders for a message from account-verification-noreply@google.com to see if the email ended up in there.

Additional information

Your other email provider has to provide authenticated SMTP support for you to use this option. We’ll use TLS by default, or SSL if you enable it. Many email services that provide POP or IMAP support also offer authenticated SMTP support, and you can likely find your SMTP server configuration instructions alongside information about POP or IMAP. Also, this new version of custom ‘From:’ doesn’t work with Yahoo! Mail Plus accounts just yet.

If the address you’re adding is hosted by Google (either a Google Apps account or a @gmail.com address), your original address will still be included in your email header’s sender field to help prevent your mail from being marked as spam. Most email clients don’t display the sender field, though some versions of Microsoft Outlook may display “From yourusername@gmail.com on behalf of customaddress@mydomain.com.”

In osx and ios

Here’s information on adding email aliases in mail on OS X and IOS
(below info from six colors)

OS X

On OS X, launch Mail, go to Mail > Preferences, and select the Accounts pane. If you’re using a standard IMAP, POP, or Exchange account, all you should need to do is find the field listed as Email Address, and add a comma followed by the other address.

(Note: If you’re using an iCloud account on OS X Yosemite, you may notice that Email Address is un-editable, showing up as a grayed-out field. Choosing “Custom” from the Alias dropdown above Email Address makes the field editable, but even after adding the aliases, I had no luck sending email from them via iCloud’s outgoing mail server. For more on a workaround, see below.)

Now, when you send an email, place the cursor over the From line and choose from the drop-down menu which address you’d like the email to come from. (On OS X, Mail seems to be smart enough that when you reply to a message it automatically sets the From line to the same address the original message was sent to.)

iOS

On iOS, this feature is hidden a little deeper, but it’s still pretty easy to set up. If you’re running a standard IMAP or POP account, you should be able to add additional email addresses with ease.

Open Settings > Mail, Contacts, Calendars and select an email account. (Note: As above, iCloud—and also Gmail—accounts won’t work in the same way, but I’ll address those below.) In the following screen tap on Account and then tap on Email. You’ll see a screen listing the primary email address and then an entry for Add Another Email. Tap that and enter the email address you want to use, then hit the Return key on the keyboard (make sure you do that, because if you navigate away from the screen in any other way, it won’t save).

When you’ve done that, you should once again see the Add Another Email entry below your new address. Now you can back all the way back out, making sure to hit the Done button in the top right corner of the previous screen.

As on OS X, when you send an email, you should be able to tap the From address in the compose screen to choose your address—you may actually need to tap it twice: once to expand the full list of headers, and again to choose the address. iOS, in my brief tests, doesn’t seem as good about automatically choosing the appropriate email address for replies, so keep that in mind.

iCloud and Gmail accounts

You’ll probably notice if you try to follow the above instructions that you can’t add any aliases to an iCloud account that aren’t for iCloud.com (and you have to go all the way to the iCloud web interface to do even that). Gmail accounts on iOS, meanwhile, don’t appear to let you add aliases at all.

There are a couple options here. One is to instead re-create your Gmail or iCloud account using the generic IMAP configuration rather than the provider-specific options that iOS and OS X offer. For iCloud, you’ll need this support doc for the correct settings for Google, you’ll have to wade through this interactive tool, or simply look around for instructions on manual IMAP configuration for Gmail. However, as noted above in the OS X section, those addresses may not even work after all those perambulations, since Apple’s outgoing iCloud server is apparently very strict about what addresses you use.

So, before you go down that bleak path, I’ve found a faster, simpler workaround. If you already have any generic IMAP account set up on your Mac or iOS device, follow the instructions above to add the additional email alias to that account. iOS doesn’t directly link addresses to mailboxes, so when you compose a message or a reply you can choose any address or alias that is set up on your iOS device. It’s way easier and doesn’t require you to go through the hassle of reconfiguring your account.