Outlook
A family of Microsoft email and calendar products.
4,504 questions
macOS Legacy Outlook only allows SHA-1 and SHA-256 to be selected as options for the signing algorithm using S/MIME
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(115.19999999999999, 72%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Andrew
0
Reputation points
I'm using S/MIME with Legacy Outlook for Mac, and I'm unable to select either SHA-384 or SHA-512. Those two options are greyed out. Is there a way to fix this? All possible encryption options remain available. I've tested this with different certificates.
Thanks!
Outlook
Office Mac
Office Mac
Office: A suite of Microsoft productivity software that supports common business tasks, including word processing, email, presentations, and data management and analysis.Mac: A family of Apple personal computers that run the macOS operating system.
541 questions
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(198.4, 10%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESM%3C/text%3E%3C/svg%3E)
SokiGuo-MSFT 31,461 Reputation points Microsoft External Staff2025-01-21T07:37:58.4333333+00:00 Hi @Andrew
Welcome to our forum!
For better research, please provide more details about this case:
Do other users in your organization have this issue?
Try logging in on a different device to see if you have the same problem?
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SokiGuo-MSFT 31,461 Reputation points Microsoft External Staff
2025-01-28T06:34:00.9133333+00:00 Hi @Andrew
Haven't received your message for a long time. I am checking the status of this case. Please let us know if you would like further assistance.
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Andrew 0 Reputation points
2025-01-31T02:39:52.59+00:00 Hello! I'm not using Outlook as part of an organization, but rather with a certificate signed by a public certification authority. I'll try creating another user account on this MacBook and see if this problem occurs.
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Andrew 0 Reputation points
2025-01-31T03:16:14.48+00:00 This problem still occurs with a new user account on my MacBook.
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Andrew 0 Reputation points
2025-01-31T03:17:02.5833333+00:00 This problem still occurs even with a new user account.
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