7,920 questions
SSL is deprecated. TLS is what you are really using. STARTTLS is actually a command.
See:
SSL/TLS and STARTLS
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(304, 60%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Андрей Михалевский
3,451
Reputation points
Hi. Exchange 2019 on-premise.
What is the difference between the two protocols? Most external systems in the SMTP only work with STARTLS and do not work with SSL/TLS
Does it depend on the external server or my server? What does support for both protocols depend on?
I don't understand where and how these protocols are configured, work.
Exchange Exchange Server Management
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Андрей Михалевский 3,451 Reputation points
2021-12-28T14:36:40.443+00:00 
I don't understand what the choice of these protocols depends on.
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Kael Yao 37,746 Reputation points Moderator2021-12-31T09:14:10.997+00:00 Just checking in to see if above information was helpful. Please let us know if you would like further assistance.
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Accepted answer
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Andy David - MVP 157.4K Reputation points MVP Volunteer Moderator2021-12-28T15:16:26.763+00:00