Terry Sullivan
Member
- Outlook version
- Outlook 2016 64 bit
- Email Account
- POP3
Any e-mails I send using an Outlook group box are resulting in kickback "undeliverable" error messages from all 70 members of said Outlook group box. I use Gmail via POP/SMTP in Outlook 365. This problem has recently come back to haunt me after several months of working properly. Before that, I also had the same problem for a number of months.