Email errors and troubleshooting
Solutions for bounced emails, blocked sending, and attachment errors
By Kolleno and 1 other2 authors6 articles
Email bounced back saying an error occurred when delivering to recipientThis article will go through the multiple reasons emails bounce back when being sent through Kolleno.
Why You Can’t Reply to Emails from onmicrosoft.comReplies to @onmicrosoft.com addresses are blocked as they aren’t monitored or customer-facing.
Troubleshooting Email Errors with Invoice PDF AttachmentsError sending invoice email due to PDF attachment issue—check ERP or contact your admin.
Difference Between Manual and Workflow Emails With BOUNCE or COMPLAINT Contacts (Custom DNS Only)Understand how manual and workflow emails handle BOUNCE/COMPLAINT contacts and how to fix blocked workflows.
Troubleshooting Duplicate Email SignaturesLearn how to identify and resolve duplicate signatures appearing in Kolleno automated emails due to external email client configurations.
Securing Your Microsoft 365 Integration with KollenoMFA, sign-in restrictions, and account security best practices protect your Outlook integration with Kolleno.