Is there any standard behavior in response to STARTTLS 430 4.7.0

[Marius Gologan]

Hi,


Is there any standard behavior in respect to 430 4.7.0? 

For example, clients such as facebook, messagelabs don't deliver messages
using TLS constantly. 

Would they retry immediately with TLS or they will keep rotating IPs until
one is using STARTTLS?

 

Thank you.

 

Marius.

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