Inflectra Customer Forums: SMTP server response: Concurrent connections limit exceeded (Thread) We are using the smtp.office365.com for sending emails from SpiraTeam installed on-premise. We have to support emails to company internal users and external customers. There are some limitations by Microsoft (see https://docs.microsoft.com/en-us/exchange/troubleshoot/send-emails/smtp-submission-improvements ) using their SMTP service. Is there a way to configure the number of concurrent SMTP connections SpiraTeam can use at a time? It seems that messages get lost, when this error occur. en-US(C) Copyright 2006-2026 Inflectra Corporation.support@inflectra.com/Computers/Software/Project_Management//Computers/Software/Quality_Assurance/KronoDesksupport@inflectra.comhttp://www.inflectra.com/kronodesk/forums/threads120/Support/Forum/spirateam/issues-questions/2556.aspxthreadId=2556Kai Gerhold (kai.gerhold@apartis.de)smtp office365SMTP server response: Concurrent connections limit exceeded We are using the smtp.office365.com for sending emails from SpiraTeam installed on-premise. We have to support emails to company internal users and external customers. There are some limitations by Microsoft (see https://docs.microsoft.com/en-us/exchange/troubleshoot/send-emails/smtp-submission-improvements ) using their SMTP service. Is there a way to configure the number of concurrent SMTP connections SpiraTeam can use at a time? It seems that messages get lost, when this error occur. Thu, 13 Jan 2022 17:28:41 -05002022-01-13T18:00:53-05:00/Support/Forum/spirateam/issues-questions/2556.aspxmessageId=4229David J (adam.sandman+support@inflectra.com) Hi Kai There is the same problem when you use Google Workspace as well, both Office365 and G Works Hi Kai There is the same problem when you use Google Workspace as well, both Office365 and G Workspace dont allow their email accounts to be used as a bulk mailer. SpiraTeam does not have a way to limit the number of emails, so I would either cut down on the number of notifications in use, or switch to system dedicated to sending bulk emails. For example you can use a free mail server such as hMail or Amazon SES if using a cloud platform. Regards David Thu, 13 Jan 2022 18:00:53 -05002022-01-13T18:00:53-05:00/Support/Forum/spirateam/issues-questions/2556.aspx#reply4229