Email Bombardment
The first and least severe penalty to giving out your email address is the email bombardment you will likely receive. If some store wants your email, it’s likely because they want to send you something — this is obvious. However, some stores abuse this power more than others. As a result, one store can send you several emails a day, flooding your inbox and making your account less efficient.

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Sensitive Information
Some people utilize sensitive information to comprise their email addresses, for some reason. For instance, many will use their birthday as a number to make their email unique. If a malicious person were to gain access to information such as your birthday or your address, this could be a gateway to hacking your social media and banking accounts. If your email has sensitive information, think twice before exposing it to strangers.

Phishing
One could logically say that Target and Wal-Mart probably won’t use your email to phish you. However, there are smaller and less well renowned retail stores that could utilize your email for malicious purposes. These stores could send you a phishing email, prompting you to enter your vital information into a malicious website. This could obviously lead to a breach of security for several of your accounts if your information falls into the wrong hands.

It Serves As an ID For Multiple Websites
Think about how many websites you use your email address for as your login. For this reason, your email address should be treated as a relatively private account. Giving it out to random retail stores could lead to certain employees trying to hack your online accounts. However, if you use several different emails for different websites, then this should not raise a concern for you.

In sum, while you shouldn’t completely avoid giving your email out to retail stores, you should heavily consider the source prior to exposing this sensitive information. While it seems safe to give out your email, this could potentially lead to catastrophic account breaches.

Gmail
Gmail has become an excellent mail service for those who have more than one job or have to manage multiple projects. The app offers several convenient ways to organize your emails into separate folders. Plus, the spam filter is phenomenal, so you will seldom see any emails in your inbox that are unfamiliar or malicious. The service holds 15GB of mail (15x what they provided when they started), so you will never have to worry about deleting emails for extra room.

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Outlook
This is an ideal app for those who use the Microsoft Outlook email service. With one interface, Outlook will provide you with your calendar, contacts, tasks, and emails. This can simplify any complex work schedule that you might have. Microsoft Outlook Office 365 Personal is normally $6.99/month, but it is free for Android.

Boxer
Boxer is an email app that is compatible with nearly all email providers. You can implement to-do lists, notifications, and a dashboard for urgent tasks. The app allows you to swipe away emails that you do not like until you have an empty inbox. Moreover, Boxer enables you to send short video snippets to other people who have the app. When you swipe, you can conveniently mark your emails as trash or spam. While this app is $4.99 for iOS, it is free for Androids.

CloudMagic
CloudMagic is the perfect app for people who manage multiple email accounts. The app combines all of your emails into one inbox, and it allows you to filter the inbox by email account. The creators of the app boast that it is compatible with all email service providers. CloudMagic allows you to choose which email account you wish to send each email from. The app has been critically acclaimed by sources such as the Wall Street Journal and the New York Times.