Are you able to send brand new emails originating from your account, but Outlook won’t let you reply or forward from existing emails in your inbox?
You will encounter an error message that states: ‘This message could not be sent. Try sending the message again later, or contact your network administrator. Unknown Error.’
If your send button on your Outlook account is greyed out, this is because your email server settings have been set incorrectly, or your account is in ‘Read Only’ mode.
We will provide you with an extensive guide, that is easy to follow, to help you with your Outlook account.
We have covered the steps you will need to take to fix your ‘Reply’ and/or ‘Forward’ button so you can carry on responding to your emails.
Why won’t Outlook let me reply to emails

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From your email account no longer be configured to a corrupt file in your browser, we have generated the reasons why Outlook won’t let you reply to emails.
Reason 1. Outlook not activated
If you were on a trial run for Outlook and you did not activate your account before the trial expired, you will not be able to use the ‘Reply’, ‘Forward’ and ‘Create’ functions.
This is called ‘Reduced Functionality Mode’
Reason 2. Email account is not configured
An incorrectly configured email account on Outlook will not provide you with the option to push ‘Send’ because it will be greyed out.
There could be a setting that is blocking Outlook from allowing you to reply or forward an email.
Another reason why your Office 365 Outlook reply is greyed out is that the settings for the mail server are incorrect and the communication between your account and the server cannot occur.
Outlook could have unintentionally removed your account details if there was a system glitch on your device.
Reason 3. Third-party interference
If you access your email via your browser, and a third party application interferes with your account, Outlook won’t let you reply or forward.
This could be from an extension or an add-in.
Reason 4. Update required
Microsoft Outlook will automatically be updated when there is an upgraded version available.
This is a default setting, however, it could be set on ‘Manual’ or the update was disrupted. A poor internet connection can interfere with the Outlook update is installed successfully.
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How do I turn on Reply Forward in Outlook?

How to fix Outlook won’t let me reply or forward
You can turn on your reply, forward in Outlook by completing these steps to ensure your Outlook account is configured correctly.
Fix 1. Update Microsoft Outlook
Fix 2. Re-configure account
Fix 3. Activate Outlook license
Fix 4. Open Outlook in safe mode
Fix 5. Check your personalization settings
Fix 6. Check the Outlook server
Conclusion
Whether you have an Outlook account for business or personal use, you must be able to stay up to date with any communication that is sent your way.
We don’t need to reply or forward an email as soon as it appears in our inbox, but it is important to be able to respond when we want to, and to ensure our mail successfully reaches our recipient.
We hope you were able to get your Outlook email account back to allowing you to ‘reply’ and/or ‘forward’ on your current mails so your receivers do not need to wait any longer.
If, however our steps were not enough, you can check out Outlooks’s Community Page. You can speak to someone directly on (+44) 344 800 2400.