How to add sender domain to safe senders list in Outlook?
Sometimes, you need to add some important sender domains into your safe senders list in your Outlook, so that you can ensure the emails from these domains are never regarded as junk emails. Today, I can introduce you some methods to add domain to safe senders list.
Add a domain to safe senders list with Never Block Sender’s Domain function
Add multiple domains to safe senders list with Junk E-mail Options
Add multiple domains to safe senders list with Kutools for Outlook
Add a domain to safe senders list with Never Block Sender’s Domain function
With this small handy function, you can quickly add the selected email sender domain to the safe senders list.
1. Select a message that you want to never block its sender domain.
2. Then click Home > Junk > Never Block Sender’s Domain, see screenshot:

3. And a prompt box will appear to tell you the sender’s domain of the selected message has been added to your safe senders list.

4. Click OK to close the prompt box, and the emails will never be blocked if their domains are added to the safe senders list.
If you need to add multiple sender’s domains to the whitelist, you can repeat above steps to add them one by one.
AI Mail Assistant in Outlook: Smarter Replies, Clearer Communication (one-click magic!) FREE
Streamline your daily Outlook tasks with the AI Mail Assistant from Kutools for Outlook. This powerful tool learns from your past emails to offer intelligent and accurate responses, optimize your email content, and help you draft and refine messages effortlessly.

This feature supports:
- Smart Replies: Get responses crafted from your past conversations—tailored, precise, and ready to go.
- Enhanced Content: Automatically refine your email text for clarity and impact.
- Effortless Composition: Just provide keywords, and let AI handle the rest, with multiple writing styles.
- Intelligent Extensions: Expand your thoughts with context-aware suggestions.
- Summarization: Get concise overviews of long emails instantly.
- Global Reach: Translate your emails into any language with ease.
This feature supports:
- Smart email replies
- Optimized content
- Keyword-based drafts
- Intelligent content extension
- Email summarization
- Multi-language translation
Best of all, this feature is completely free forever! Don’t wait—download AI Mail Assistant now and enjoy!
Add multiple domains to safe senders list with Junk E-mail Options
If you know the sender domains that you want to add to whitelist, you can type them one by one into the safe sender list.
1. Go to Home > Junk > Junk E-mail Options, see screenshot:

2. In the Junk E-mail Options dialog box, click Safe Senders tab, and then click Add button, in the popped out Add address or domain box, enter the sender domain to the text box that you want to never block, see screenshot:

3. And then click OK, the entered sender domain will be added into the Safe Senders List. You can click Add button to add other domains as you need.

4. After finish adding all the sender domains that you want to never block, click OK to close the Junk E-mail Options dialog box.
And the emails from these specific sender domains will never be filtered to junk email folder.
Add multiple domains to safe senders list with Kutools for Outlook
With Kutools for Outlook, you can quickly add multiple selected sender domains to the safe senders list at once.
If you have installed Kutools for Outlook, please do as follows:
1. Click Kutools > Junk Email Filter > Enable Junk Email Filter to activate this function, see screenshot:

2. Hold Ctrl key and select the emails that you want to add the sender domains to the whitelist.
3. Then click Never Block Sender Domains under Junk Email Filter, and a prompt box pops out to remind you that the selected emails sender domain are added to the safe senders list. See screenshots:
![]() | ![]() | ![]() |
4. Click OK to close the prompt box, and then you can go to the Junk Email Filter Manger to preview the rule, in the dialog box, you can edit, delete, export or import the rule. See screenshots:
![]() |
![]() |
![]() |
After adding the sender domains to the safe senders list, the rule will be applied to the incoming emails.
Click to know more about this Never Block Sender Domains feature.
Related articles:
- How to add sender domain to blocked senders list in Outlook?
- How to add email addresses to safe senders list in Outlook?
- How to add senders address to blocked senders list in Outlook?
- How to block emails based on specific subject in Outlook?
Best Office Productivity Tools
Breaking News: Kutools for Outlook Launches Free Version!
Experience the all-new Kutools for Outlook with 100+ incredible features! Click to download now!
📧 Email Automation: Auto Reply (Available for POP and IMAP) / Schedule Send Emails / Auto CC/BCC by Rules When Sending Email / Auto Forward (Advanced Rules) / Auto Add Greeting / Automatically Split Multi-Recipient Emails into Individual Messages ...
📨 Email Management: Recall Emails / Block Scam Emails by Subjects and Others / Delete Duplicate Emails / Advanced Search / Consolidate Folders ...
📁 Attachments Pro: Batch Save / Batch Detach / Batch Compress / Auto Save / Auto Detach / Auto Compress ...
🌟 Interface Magic: 😊More Pretty and Cool Emojis / Remind you when important emails come / Minimize Outlook Instead of Closing ...
👍 One-click Wonders: Reply All with Attachments / Anti-Phishing Emails / 🕘Show Sender's Time Zone ...
👩🏼🤝👩🏻 Contacts & Calendar: Batch Add Contacts From Selected Emails / Split a Contact Group to Individual Groups / Remove Birthday Reminders ...
Use Kutools in your preferred language – supports English, Spanish, German, French, Chinese, and 40+ others!


🚀 One-Click Download — Get All Office Add-ins
Strongly Recommended: Kutools for Office (5-in-1)
One click to download five installers at once — Kutools for Excel, Outlook, Word, PowerPoint and Office Tab Pro. Click to download now!
- ✅ One-click convenience: Download all five setup packages in a single action.
- 🚀 Ready for any Office task: Install the add-ins you need, when you need them.
- 🧰 Included: Kutools for Excel / Kutools for Outlook / Kutools for Word / Office Tab Pro / Kutools for PowerPoint