Problems & Solutions

Setup issues

• Active Directory attributes are not populated in hybrid environment

Outlook signature issues

Mailflow issues

• A signature is not applied to emails with large attachments
• Emails with a signature fail to recall successfully
• Non-delivery report errors and solutions
• Non-delivery report 550 5.1.8 Access denied, bad outbound sender
• Non-delivery report 550 5.4.1 Recipient address rejected: Access denied

Troubleshooting

• Tasks, contacts and voting buttons are removed from internal emails sent using Signature 365 server-side signatures
• Using Outlook message recall with Signature 365
• Inserting a signature in a specific location with Server-side injection
• Disabling Outlook signatures in New Outlook and OWA