Hi,

Port 587 is smtp with START_TLS.
The connexion start in clear (un encrypted) and upon smtp protocol negotiation 
the connexion will be switched to secured/SSL/TLS.

This feature was added in 4D IC v13.2. 

There is no way port 587 will work with older versions of 4D.

You can try explicit SSL/TSL on port 465 with 
        SMTP_Send( ... ;1)

Having said that, you are facing a problem of an old tool with outdated 
security protocols and it could be that the ssl/tls version in 4D IC v11 are 
not compatible with current smtp servers (or rejected because considered 
outdated/unsafe). 

HTH
Bruno

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