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  • BJ Patel 84 posts 210 karma points
    Oct 17, 2023 @ 12:42
    BJ Patel
    0

    newsletterstudio / Delivery failed "Encountering Email Delivery Error: '4.3.2 Concurrent Connections Limit Exceeded' -

    Facing a recurring issue with email delivery and could use some guidance to resolve it.

    Whenever a campaign is run, a number of email recipients do not receive the email, and the error message received (Delivery failed) is as follows:

    Error-details: Syntax error, command unrecognized. The server response was: 4.3.2 Concurrent connections limit exceeded. Visit https://aka.ms/concurrent_sending for more information. [Hostname=CWLP265MB6150.GBRP265.PROD.OUTLOOK.COM] StackTrace: at System.Net.Mail.DataStopCommand.CheckResponse(SmtpStatusCode statusCode, String serverResponse) at System.Net.Mail.DataStopCommand.Send(SmtpConnection conn) at System.Net.ClosableStream.Close() at System.Net.Mail.SmtpClient.Send(MailMessage message) at NewsletterStudio.Core.Sending.Providers.SmtpEmailServiceProvider.Send(List`1 batch) Source: System

    The campaign has over 900+ Recipients and 150 + Delivery failed

    As the SMTP Host is: smtp.office365.com

    Use SSL = true and Port = 587

    enter image description here

    Newsletter studio : V 3.x

    Umbraco V8.x

    Copy Link
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