Kutools For Outlook 2016 ~upd~ Jun 2026

"Outlook crashes when using Mail Merge on 50+ recipients." Solution: Reduce batch size. Go to Mail Merge Settings and set "Send in batches of 20." Also, ensure your antivirus is not scanning outgoing SMTP traffic.

One concern with Outlook add-ins is performance degradation. Older versions of Kutools (pre-2018) had a reputation for slowing down startup time. However, is optimized for low memory usage. kutools for outlook 2016

: Automatically remove greeting lines or signatures when replying, or use the "Safe" mode to prevent accidental "Reply All" clicks. Why Use It? "Outlook crashes when using Mail Merge on 50+ recipients