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Gets or sets the email address of the signer of the document. Read/write.
string SuggestedSignerEmail { get; set; }
Property SuggestedSignerEmail As String
ISignature signature = workbook.Signatures.AddSignatureLine(worksheet, 100.0, 50.0, 192.0, 100.5);
ISignatureSetup setup = signature.Setup;
setup.SuggestedSignerEmail = "alex.wilson@example.com";
string email = setup.SuggestedSignerEmail;