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If a server certificate needs to be checked
HowTo setup a Let's Encrypt SSL Certificate on Centos 7
Some tips to secure your web server
Configure TLS in Postfix and Dovecot
We don't want to do cleartext authentication against a POP3 or IMAP server and fetch the e-mail unencrypted.
Fetchmail will be configured for ssl to encrypt the communication to the corresponding server.
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