I am using TB 31.3.0 with Mail Merge 3.9.1. I routinely send an email to 435 members of an volunteer emergency responders group that I coordinate. I do so using a .csv list with mail merge. While there were no problems in the past, more recently the mail merge function will hang after sending a varied number of messages successfully and I get the following error message: "An error occurred sending mail. The mail server sent an incorrect greeting: 4.3.2 connection rate exceeded.." There is an "OK" button in the error message pop up that can be clicked to resume the mail merge process. It would appear that if I click the "OK" button immediately whenever the error message is received I must do so frequently and some members do not receive their email. If I delay clicking the "OK" button, I found that I only needed to click the "OK" button twice to send to all the members. An on line search suggests this is the result of some sort of throttling by my ISP, Sonic.net. There is also this comment: "If you are receiving this error, you are likely using mailing list software which cannot decipher the temporary fail codes. If so, you will need to set your software to slow down its delivery rate and/or reduce the number of active connections per remote host." I am not super technical. Is it realistic to think that I can tweak mail merge to that I do not have to babysit my email to this group?