SMTP mail sending

Hi all,

I have an NCS installation, nowadays it can’t send email, any idea?

Error sending Email using [] to Address XXX@XXXXX.XX
Exception Detail: System.Net.Sockets.SocketException (0x80004005): A socket operation failed because the destination host was down
at EASendMail.SmtpClient.0V(Object 7v)
at EASendMail.SmtpClient.3{()
at EASendMail.SmtpClient.1k(Certificate 7v)
at EASendMail.SmtpClient.Connect(SmtpServer server)
at EASendMail.SmtpClient.SendMail(SmtpServer server, SmtpMail mail)
at ..()

telnet 587
Connected to
Escape character is ‘^]’.
220 Microsoft ESMTP MAIL Service ready at Mon, 22 Apr 2024 11:49:43 +0000