How does Zammad handle the Cipher-Suites?
Does Zammad use the specified ciphers within the /opt/zammad/vendor/ruby-2.5.5/lib/ruby/2.5.0/openssl/ssl.rb file? And does the /opt/zammad/vendor/ruby-2.5.5/lib/ruby/2.5.0/net/imap.rb component references to this file? The connection to the Mail-Server is working with ECDHE-XXX and the cipher is present in the ssl.rb but Zammad is not able to fetch emails.