If this issue is with an invoice, sales order, purchase order, statement or remittance layout, remove the email signature.
On the menu bar, go to Settings then select Email Defaults.
Select the relevant tab, for example, Invoice.
Select the Override Default Outlook Signature dropdown and select No.
Press Apply, select the required layout, then press OK.
Email your layout again. If it's successful, there can be an issue with your Outlook email signature. To resolve this, recreate the signature and reduce any image resolution.
If nothing happens or an error appears, Outlook isn't the default mail provider. Contact your IT support to repair Microsoft Outlook.
If the issue occurs with any report or layout after completing all steps, reinstall Microsoft Office as an administrator. Contact your IT administrator for help.
If you still require further help with this, get in touch.