Microsoft Outlook Email Security Settings

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Microsoft Outlook Email Security Settings – An email server with weak security settings is like a fortress without walls. The bad guys will go straight! Unfortunately, Microsoft Office 365 email security leaves a lot to be desired. In fact, its default settings are terrible!

Email security is important because it is the most common attack vector for attackers trying to break into a company’s network. This is the easiest way for bad guys to spread ransomware, spyware, worms, different types of malware, social engineering attacks and other cyber threats. Once a hacker gets to your email, it’s easy to steal sensitive data such as Personally Identifiable Information (PII), Protected Health Information (PHI) and even intellectual property.

Microsoft Outlook Email Security Settings

Microsoft Outlook Email Security Settings

Cloud email application for Office 365 users has always been the target of phishing, malware and data breaches. Microsoft has improved its security features but its default settings are frankly terrible. Finally, there are many configurations to improve the security of your Microsoft Office 365 email.

Outlook Keeps Asking For Password (office 365)

Before digging deeper, Microsoft 365 was known as Office 365. People call it both these terms M365 and O365. I also used it together. If you think this is complicated, wait until you see the license model…

So… After getting a Microsoft licensing degree (I’m kidding but you wanted to take a course like this, right?), I learned about the security features of Microsoft Office 365 email. in-depth licenses.

Security should be standard, but Microsoft unfortunately hides many settings behind more expensive licenses, leaving small businesses vulnerable.

I will go through each of the Office 365 email settings and explain what is the most secure option. I will also identify which Microsoft license the configuration requires and any problems that may occur during their implementation.

Emailing Via Outlook

So, if you’re an existing user/administrator, go back to your settings and verify these controls are in place. If you don’t, apply them! You’ll make major improvements to your Office 365 email security and reduce the chance of your business being hijacked by a hacker in the process.

It is very dangerous unless a business email system without spam filtering is used. Not only is it becoming a nuisance in your inbox, but as spammers become increasingly sophisticated and creative with their tactics, addressing this burgeoning threat is crucial.

Most email services have default settings to filter spam and spam and return such emails to the sender. So is Microsoft. Theoretically, when administrators find that certain accounts are sending too much spam, they should disable the account to avoid IP blocking. (A blocked account is a good indication that that account has been compromised and is being used by an attacker to send spam). That’s why external spam control is crucial to help prevent IP blacklisting.

Microsoft Outlook Email Security Settings

Make sure ‘Send a copy of external messages that exceed these limits to these users and groups’ is ON. Select + Add Contact. Also make sure ‘Notify specific people if senders are blocked’ is set to ON and add people who will receive notifications.

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A malware attachment in an email can turn an innocent email into a gateway to your computer. Scanning email attachments can help block known malicious files and prevent malware-infected files from infecting the host. This custom setting allows organizations to block known and specific malicious files that are commonly used to distribute malware.

To work with your item, go to Security > Threat Management > Policy > Anti-Malware. Change the default profile and under the Security settings tab enable “Enable shared plugin filter” to Always.

This alerts administrators that an internal user has sent a message containing malware that could indicate an account or machine breach that needs investigation.

Enabling this does not affect users with potential problems or their account information.

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Central Administration > Security > Threat Management > Policy > Anti-Malware > Enable Admin Notification about messages from internal senders and make sure there is at least one email address under ‘admin email address’.

Consider the following hypothetical scenario: Somehow someone (external or internal) hacks into a senior executive’s email account. They sneak in and set all emails to be sent to “[email protected]”. They keep getting a copy of your emails and you may never notice it. To avoid this, you need to set your rules so that emails are not sent to domains outside of your organization.

If you’re setting up a new corporate email system, just go ahead and disable it; If not, make sure there is no current business use for automatic switching on a case-by-case basis, as disabling this setting may affect users in your organization.

Microsoft Outlook Email Security Settings

To stop sending emails to external domains, go to the Management Center. Go to Settings > Mail Flow and Rules > Make sure none of the rules are forwarded to an external domain. For each rule, select (advance for external domain) and click delete.

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I roll my eyes, these seem like basic email protection features that should be enabled by default, let alone pay extra to use them.

Sender Policy Framework (SPF) records are used to prevent spammers from forging your domain name and help prevent your outgoing messages from being marked as spam. It lets mail systems know where messages from your domains are allowed to be created. thus allowing the system to determine if it has been tricked.

Authentication, Reporting, and Authentication (DMARC) works with SPF and DKIM to authenticate email senders and protect your brand by preventing unknown parties from sending emails from your domain. DMARC not only prevents your domain from being spoofed, but also ensures that your emails are legitimate. DMARC has a great return on investment – if you implement it, your emails are more likely to be delivered, thus making your marketing campaigns more effective.

There should be minimal impact, but make sure it’s set up properly to ensure a steady flow.

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DomainKeys Recognized Mail (DKIM) fights fraud by adding a digital signature to your emails that is always reviewed by your ISP. It is an email authentication technique that allows recipients to check that an email is sent and authorized by the listed domain. In addition to SPF and DMARC, you should definitely use DKIM to prevent spoofers from sending messages that appear to come from your domain. By owning all domains in your organization using DKIM, you also send yourself a reputation in the eyes of any business partner, customer, or other third-party service you interact with. Remember, DKIM works best when more organizations use it.

Central Administration > Security > Threat Management > Policy > DKIM > (for each domain), enable signing of messages with DKIM signature for this domain.

Basic authentication protocols may allow users to gain access using legacy or unauthenticated email clients that do not support modern authentication mechanisms such as Multi-factor authentication.

Microsoft Outlook Email Security Settings

Forcing a brute force password makes the job a lot easier for the bad guys. They’ll send you a phishing email, somehow trick you into logging into O365, you’ll probably think I don’t have to worry as we have MFA. But now they have your pw and they can use SMTP or those old protocols and go there to change settings and send phishing emails (plus they look legit now, good reason, they actually come from a legitimate source)

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Central Administration > Azure Active Directory > Security > Conditional Access > New Policy. Then, include these terms in the policy:

Go to Terms and Conditions, then enable Client applications and settings for Exchange ActiveSync clients and other clients. Under Access controls, set the Allow section to deny access. Under Tasks, enable All Users.

Disabling this will prevent the use of old and untrusted email clients with weaker authentication mechanisms that increase the risk of compromising email account trust.

MailTips provides end users with visual assistance when sending emails to large groups of recipients or non-tenant recipients.

Implementation Of Office 365 Message Encryption (ome)

If you are using E5 licenses, congratulations! You have the power to be much safer. Make sure you get the most out of the E5 license and have an expert configure these features. They will likely require regular updates to keep your Microsoft Office 365 email security as strong as possible.

You can set additional policies to enhance Microsoft’s current protection against phishing attacks. The E5 L1 license gives administrators the chance to create custom policies that can be configured for specific users, groups or domains and actions.

Enabling this allows the processing and rewriting of emails containing URLs. This control extends phishing protection and blocks malicious hyperlinks even after the email is sent to the end user.

Microsoft Outlook Email Security Settings

This setting extends attachment protection and malware protection and checks email attachments for malware. Plugins with no known malware signature are sent to a specific hypervisor

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