Recent updates creating issues with message resend and email signature spaces

Question

We have recently noticed that when clicking to resend an email the body of the email disappears and we have to press command z to restore the wording to send the email.

on signatures we have also noticed our logo on our signature randomly stops showing and when we have included wording on signatures all line spaces have disappeared yet show correctly on manage signatures.

things happening on two separate macs under different outlook accounts so not an isolated incident in both cases.

this was all fine but recent updates appear to have caused the issue and it’s creating more work.

Answer 1

@LT Support said

on signatures we have also noticed our logo on our signature randomly stops showing and when we have included wording on signatures all line spaces have disappeared

If your symptoms are the same as described in this post, it's a known bug and still not fixed as of Outlook for Mac 16.109.3
https://learn.microsoft.com/en-us/answers/questions/5896340/spacing-removed-from-outlook-for-mac-signature

Answer 2

Hi @LT Support, 

Good day. Sorry you're going through this, and i appreciate you sharing the details of your situation. 

Just a quick note before we continue: this is a user-to-user community forum, so I don’t have access to your Microsoft 365 tenant, your account, or your device to make changes directly. However, I’m here to support you the best I can within these constraints, by providing clear next steps, sharing applicable resources, and directing you to the appropriate support channels. 

Based on what you described, the behavior does not appear to be related to any user-side configuration, especially since similar issues are occurring on different devices and across different Outlook accounts. As this started after the most recent update, it appears more likely that this may be a temporary issue or compatibility-related behavior introduced by the latest Outlook for Mac update. 

1/ Report the issue through the Microsoft 365 Admin Center 

Given this situation, I strongly recommend contacting your organization's IT administrator and asking them to report the issue through the Microsoft Admin Center. This helps Microsoft track, prioritize, and investigate service-related problems more effectively. 

• In case you do not know who is your IT admin, kindly refer to this article: How do I find my Microsoft 365 admin? - Microsoft Support  
• Steps for the Microsoft 365 Admin: 
  1. Sign in to the Microsoft 365 Admin Center 
  2. Go to Health > Select Service health 
  3. Click Report an issue 
  4. 

In the meantime, here are a few workarounds you might consider: 

• For the resend behavior, it may help to avoid using Resend for now and instead create a new message or use Forward and copy the original content across, to reduce the risk of the message body disappearing.  
• For the signature issue, one option is to edit and save the signature first in Outlook on the web, then allow some time for it to sync back to Outlook for Mac.  
• If the spacing or logo behavior continues, you may also try recreating the signature in plain text first and then reapplying the formatting in Outlook, using Shift + Return for line breaks, as this can sometimes help avoid hidden formatting or paragraph-spacing inconsistencies. 

2/ Contact Microsoft Support

Since this issue appears to be affecting multiple users in your organization, your IT administrator can submit a support request directly to Microsoft through the "Help & support" in Microsoft 365 Admin Center. This will allow Microsoft Support to further investigate the issue by reviewing the affected environment, relevant diagnostic information, and service-related details in order to determine the most appropriate resolution. 

To help with the investigation, please ask your IT admins to include details such as the Outlook version, macOS version, affected user accounts, and any screenshots or screen recordings of the issue. 

I hope this helps clarify the situation, and I sincerely hope the issue will be resolved soon. Should you have any further questions or need additional assistance, please feel free to share them in the comment below. I'm very happy to help.   

Thank you again for your understanding and cooperation.    

Wishing you all the best. 

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Answer 3

The described behavior matches known Outlook for Mac issues introduced by recent builds that affect signatures and, more generally, message composition. These issues have been fixed in newer Outlook for Mac versions.

Recommended actions:

1. Update Outlook for Mac to the latest build
   • Several signature-related bugs (including missing signatures and disabled image options) were introduced around version 16.63 and later builds, and then fixed in subsequent releases.
   • Specifically, an issue where signatures could not be created or appeared missing after 16.63 was fixed in build 16.64.
   • Another recent build (16.107.4) changed the Settings interface and affected signature behavior; this was resolved in build 16.108, where signatures and image handling returned to normal.
   • On each affected Mac, open Outlook and update via Help → Check for Updates (or via Microsoft AutoUpdate) and ensure Outlook is on the latest production build (at least 16.64 for the earlier issue, and 16.108 or later for the more recent signature regression).
2. Re-test after updating
   • After updating, test both scenarios:
     • Resend a message and confirm the body content remains visible without needing Command+Z.
     • Compose a new message and verify that the signature logo and line spacing appear correctly in the message body, matching what is shown under Manage Signatures.
3. If issues persist after updating
   • Because these are known, fixed regressions, if the Macs are already on the latest build and the behavior continues, capture the exact Outlook version (Outlook → About Outlook) and open a support case or post in the Outlook Tech Community with that version information so the Outlook team can check for a new regression.

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References:

• Can't create new signatures in Outlook for Mac and existing signatures are missing
• Fixes or workarounds for recent issues in Outlook for Mac
• Signature not allowing use of images (Mac Outlook) - Microsoft Q&A