Yahoo Mail is designed to provide you with fast and easy access to your Yahoo! email account from your iOS device - without having to load the mobile web site.
Yahoo Mail offers a comfortable ride in terms of navigating your email. Its interface is easily readable and clearly laid-out. Just like the Gmail app for iOS, folders and options appear in a panel on the right with your list of mails showing next to this. Tap on a mail header and the email will be displayed in a preview pane on the right. Options for replying, trashing, blocking, starring, etc. appear at the bottom of the email pane.
Searching mails in Yahoo Mail is not frustrating, especially since the addition of an improved search function in version 3.2.1 of the app. When searching for a person's name you now get the option to filter results by emails, photos, or files.
A nice feature of Yahoo Mail, carried over from the web version, is its support for themes. There are several attractive designs to choose from in a range of color schemes, so you can tailor your email client to suit your mood.
Yahoo Mail is well optimized for iPad, and it's a very comfortable experience.
Yahoo Mail's shiny, attractive interface masks a few niggly problems under the hood of the app. For instance, the spam filtering of Yahoo Mail is questionable. Often, I found genuine emails in the spam folder, while junk was littering my inbox. For me, spam is definitely more of an issue in Yahoo Mail than it is in Gmail or Outlook.
The Yahoo Mail app is free and supports push notifications, meaning that you'll get instant alerts when you receive a new mail.
Yahoo Mail for iOS is simple but complete: it provides fast access to your folders (i.e. inbox, drafts, sent mail and spam), allows you to access your address book, compose emails, and attach photos or files to your messages. You can also use the Yahoo Mail client for iOS to organize your messages into folders, a process which is much easier to do than it is using the web version of Yahoo Mail.
One boon of the Yahoo Mail app is that it lets you add multiple Yahoo accounts so you can switch between your inboxes in one place.
Besides allowing you to check your email, Yahoo Mail includes an 'Apps' section, where you can check news and weather from within the application, which is cool.
If you use Gmail at the moment, Yahoo Mail isn't good enough to warrant switching to. The app is well designed and has some useful features but the spam filtering isn't good enough and the app has some niggly performance issues.