Forum Discussion
PrabakaranNagarajan
Aug 19, 2025Copper Contributor
Exchange Server 2019 SMTP Error: "Does not support secure connection" on Port 587 with SSL
When attempting to send emails using port 587 with SSL (-usessl), I receive an error stating that the server "does not support secure connection" or that it "does not support the connection encryptio...
AnnTaeYoun
Aug 20, 2025MVP
On Exchange Server 2019, SMTP port 587 does not support Implicit SSL (-usessl).
Configure authenticated SMTP settings for POP3 and IMAP4 clients in Exchange Server