Error Could not load file or assembly 'System.Formats.Asn1 with UIPath.Mail.SMTP.Activities.SendMail

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@Florent_Delage,

Open the workflow throwing this error
Open Imports Panel at the bottom which will be along with Variables panel.
Import this namespace System.Formats.Asn1 by typing or copy pasting it there.

The image shows a dropdown list within an integrated development environment (IDE) displaying various namespaces such as "System.Formats.Asn1" and others like "Microsoft.VisualBasic" and "System.Collections". (Captioned by AI)
The image shows a dropdown list within an integrated development environment (IDE) displaying various namespaces such as "System.Formats.Asn1" and others like "Microsoft.VisualBasic" and "System.Collections". (Captioned by AI)1149×323 15.3 KB

Check if the issue resolves now.