'Failure sending mail. Unable to read data from the transport connection: An existing connection was

Abdullah_Zafar

Hi everyone I have implemented some mail sending functionality to send(Posted Sales Invoices) with custom email body, when I try to send multiple it send few of them and show a message that enables sending email If I try to debug it shows them following error.
"'Failure sending mail.
Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.'"

Please suggest a solution design change or code improvement thanks

Abdullah_Zafar

Resolved the issue was due to TLS, I have added dotnet variable to set TLS 1.2 https://hougaard.com/let-nav-use-tls1-2-when-talking-to-webservices/

Abdullah_Zafar

Resolved the issue was due to TLS, I have added dotnet variable to set TLS 1.2 https://hougaard.com/let-nav-use-tls1-2-when-talking-to-webservices/