I am using Thunderbird for my Google Workspace Business Standard (GWBS) account because certain things, like navigation, searching, mail merge, and others are much nicer with TB than with the Gmail browser interface. I created the account in TB in the usual way, with no special tweaking of the settings. I routinely need to send messages to the 167 members of our program. The problem is that when I try to do so using TB, I get the error in the first attached image. The actual recipient limit for my GWBS account is 2000 per message, and there is no problem sending messages to 167 recipients using the Gmail web interface. I chatted with GW support about this and was told by the agent that "you have added 167 recipients in a single email, by using a third party IMAP server you can only 100 recipient's. You can refer to this article https://support.google.com/a/answer/166852?product_name=UnuFlow&hl=en&visit_id=638669600328475265-236899981&rd=1&src=supportwidget0&hl=en". Here's a shortened version of that link: https://bit.ly/3UPAYWJ. I believe the part of that page the agent is referring to is in the second attached image, specifically the first one. However, the server settings for this account in TB are the ones in the third image, which doesn't seem to me to be a third party IMAP server. Has anyone else come up with a solution for this problem. Any help would be greatly appreciated. John E. Anderson, Executive Director, Jacksonville Joe Berg Seminars