You can also explore some of Mail's hardest to find controls in this article here.

Outlook problems?

If you’ve been suffering problems using Outlook with El Capitan, then you should download the latest software patch released by Microsoft last week.

Google Email Client For Mac

Best Apps for Mac El Capitan - Adium Adium is a free and open source instant messaging application for Mac OS X. It can connect you to any number of messaging accounts on any combination of supported messaging services and then chat with other people using those services. Also read: Download & Install AVG for Mac OS X 10.11 El Capitan How To Change Mac’s Default Email Client Go To Apple’s “Mail “App and Choose “Preferences” from Mail menu.

Verify

Apple offers a simple online tool to verify your email settings so you can ensure they’re set correctly in Mail.

Fix iCloud account

If you can’t send email using your iCloud account after upgrading to El Capitan then following these steps may help:

  • Open System Preferences>iCloud and unclick the checkbox beside Mail to disable it.
  • Once this process completes, click on the box to turn Mail back on, and close System Preferences.
  • Launch Mail and open Preferences>Accounts. Choose iCloud.
  • Set the ‘Outgoing Mail Server’ section to the right to iCloud.
  • Close Preferences and launch Mail.

Fix Account

This fix seemed to help when OS 10.10.4 shipped earlier this year, so it seems worth trying in OS X El Capitan. If one of your accounts seems to be misbehaving (it may not be sending email, seem inactive or in other ways seem faulty), launch Mail Preferences and select the account in the Accounts tab, then click on the ‘Advanced’ tab.

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  • Look at the list and at the top of the list you’ll see the ‘Automatically detect and maintain account settings’ tick box.
  • If it is unchecked, check it and relaunch Mail; if it's checked, then uncheck it, quit and relaunch Mail, reenable it and then quit and relaunch Mail once again.

You should repeat the process for each of your troublesome accounts.

Disable Mail Extensions

If you are using any third-party Mail extensions and you’re having problems using the app, it’s a really good idea to disable your extensions and relaunch the application. This may make all the difference. If it does, then re-enable your extensions one at a time so you can identify which one is causing your problem. Then write to the developer and ask for help.

Stop the freeze

If your Mail has been crashing on launch, you can sometimes prevent this behavior by taking control of your accounts and making them turn on one at a time, instead of all at once. (Though it seems odd a Unix-based OS has a problem handling the task).

Here’s one fix:

  • Turn Wi-Fi off before launching Mail, disconnect your Mac from the Internet. This will stop Mail trying to download mail on launch.
  • Launch Mail
  • Once Mail is launched got to Mail>Preferences>Accounts
  • Select each of your Mail accounts and disable each of these using the checkbox beside each account.
  • Close Mail
  • Relaunch Mail and reconnect to the Internet/turn on Wi-Fi
  • Now enable each of your Mail accounts, one at a time; let each account download all its messages before enabling the next.

Optimizing your database

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Some Mail users are having a problem in which El Capitan claims it cannot access the server, or in which Mail gets stuck in a loop while “optimizing your Mail database.' A potential reason for this involves changes in how El Capitan handles incoming emails, which might conflict with settings you had on your previous Mail/OS iteration. An effective fix for this is to delete the email account that’s causing the problem before creating a new account with identical settings. It’s not a perfect fix – and you should create an offline archive of your messages using a utility like Email Archiver, but Apple Support threads suggest this is a good fix.

Mail

Rebuild, Reindex

El Capitan is different in many ways, but the old tips remain reliable. If nothing seems to be working, it may be time to rebuild and reindex Mail – and you should first backup, create offline archives of key messages and set some time aside for the task, which I’ve explained in an older article you can explore right here.

Contact Apple Support

If you’ve tried all these and nothing has worked, then it may be time to call Apple Support – they’re usually pretty helpful.

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Mail clients for Max OS X El Capitan are very common app that people use to try to organize all of their different emails into one single mail client for Mac. There are many different mail clients for Mac El Capitan, that have features that are useful and not useful. Some mail clients for Mac allow for great customization, while others have great features that help keep you organized. These great email clients for Mac OS X allow you to access all of your email service provider’s features in one place. With so many different options to choose from, we’ve created a list of the best mail clients for Mac OS X El Capitan that have a mix of great features, usability and value.

For those interested in getting the most out of your Mac computer, then make sure to check out Apple’s wireless magic keyboard, the Fitbit Charge HR Wireless Activity Wristband and the Western Digital 1TB external hard drive for the ultimate experience with your Apple computer.

Apple Mail

Apple Mail is the built in email client provided by Apple and is one of the best mail client for macs. Apple Mail does allow for multiple mailboxes to be setup so you can have multiple accounts integrated in a single email client on your Mac El Capitan computer. It has many great features, and every email that you setup in Apple Mail will display all new mail arriving in your inbox in the notification bar to give you a sneak peak. You also have the ability to search by attachments and attachment types, which is a great feature when you really need it.

Airmail

AirMail is an alternative mail client for Mac OS X that offers many great features and allows for usability with your IMAP-based webmail of choice. AirMail features great user interface for the design, but some of the buttons and features can sometimes be hard to see. Also, for some reason Gmail messages take some time to load and setting up Dropbox on Airmail is hard to do.

It supports a number of email accounts you can integrate with Google Apps and Exchange. It’s very easy to send attachments with an easy drag and drop of your files to your email. In case your files are stored on Google Drive or Dropbox, the app has an attachment option for them as well. Overall Airmail can be considered one of the best mail client for Mac users.

Unibox

Unibox is one of the best Mac OS X mail clients that focus more towards organization. It’s more than just sending and receiving mail with Unibox, the main feature of Unibox is the ability to filter emails by contacts. Also you have the ability to preview attachments in your email instead of having to download them first. The ability to preview attachments makes it much faster when you have limited time checking emails.

Sparrow

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Sparrow is a great mail client for Mac that allows you to quickly and easily clean your inbox within the app without having to do many complicated proceeders. It has been recently bought by Google and there should be great new features coming to Sparrow in the future.Sparrow allows for Facebook connection which makes it a great bonus feature. The focus of Sparrow is to provide a clutter-free environment for emailing, and you will notice the same as soon as you start working on an email in the app.

Mozilla Thunderbird

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The creators of Mozilla Firefox web browser developed the Thunderbird email client. Thunderbird email client is one of the oldest mail clients available and still one of the best mail client for Mac. The set up process is very easy even though the software is a little slow. There are several great features, including being able to tab emails creating a feeling like you use when using FireFox and Chrome Internet browsers.