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warning safety certificate with outlook

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Hello everyone,

I'm new to the plesk I have a dedicated server with PLESK 12.5.

I parameter outlook for the email address of my clients, for example:

domain: 123.FR

SMTP server: mail.123.fr
POP server:: mail.123.fr

SMTP on port 587 with encrypted connection: automatic.

when we open outlook and that it sends a message, the first time he asks certificate validation. every time we open outlook is the same.

after some research, it seems I have to purchase an SSL certificate and put it on...

warning safety certificate with outlook

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