In Microsoft 365 for Business, you can add a company domain name you own so that your users can have email addresses branded with your company name. For example, if your company name is Fourth Coffee, owning the fourthcoffee.com domain and having your company name in your users' emails – such as alex@fourthcoffee.com – helps you brand your business and build trust with your customers. You ...

Phishing (pronounced: fishing) is an attack that attempts to steal your money, or your identity, by getting you to reveal personal information -- such as credit card numbers, bank information, or passwords -- on websites that pretend to be legitimate. Cybercriminals typically pretend to be reputable companies, friends, or acquaintances in a fake message, which contains a link to a phishing ...

See how to view the details for signatures and certificates.

Learn how to use encryption and other security settings to protect messages sent from Outlook.

Learn more about the advanced security features for Outlook.com that come with an Office 365 Home or Office 365 Personal subscription.

Learn how to identify and open encrypted and protected emails no matter what email client you're using.

Junk email can strain networks, clog email servers, and fill mailboxes with unwanted messages and images. The server that hosts your mailbox will filter out most junk email, but not always all of it. The light version of Outlook Web App helps you control unwanted and unsolicited messages by letting you manage and create lists of trusted and untrusted email addresses and domains.

We have a range of support options to meet your business needs.

Use a ready signature template from a gallery to create your email signature in Outlook.

Block senders from sending you email in new Outlook for Windows If you're receiving unwanted email, you can block the email addresses and domains you don't want to receive messages from in new Outlook. Add any email address or domain to your blocked senders list to move these messages directly to your Junk Email folder.