When emailing invoices to the clients from ArchiOffice (or EngineerOffice), the users sometimes get the following error message from the recipient email servers:
Error: 452 4.5.3 Too many recipients
This can happen if the number of recipients on the email exceeds the limit specified in the Receive connector MaxRecipientsPerMessage on the recipient server (usually Microsoft Exchange). Most email servers continue to resend the message in another connection until the message is delivered to all the recipients. So you can normally ignore this error as the emails are still received by the recipients, but in smaller chunks. However, if your clients are not receiving the emails or if you simply do not want to see this error, you need to ask the administrator of the recipient email server to increase the MaxRecipientsPerMessage limit (if possible) with the following steps:
- Check the current Receive connector MaxRecipientsPerMessage value. To do that, run the following command in the Exchange Management Shell. (To learn how to open the Exchange Management Shell in an on-premises Exchange organization, see Open the Exchange Management Shell.)
Get-ReceiveConnector | Format-Table Name, Max*Size, MaxRecipientsPerMessage
- To set a different value, say you want to change the maximum number of recipients to 1000, run the command:
Set -ReceiveConnector -MaxRecipientsPerMessage 1000
You can find more information about the message limits in Microsoft Exchange in this article: Message size and recipient limits in Exchange Server.