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Disable SSLv2 in Cyrus IMAP server | Cyrus often ships by default with SSLv2 enabled which can be considered a security vulnerability. Here’s how to disable SSLv2 in your Cyrus IMAP server! 1. Edit the file /etc/imapd.conf sudo nano /etc/imapd.conf Find the following line, and remove the SSLv2 indication where it may be found: Before: tls_cipher_list: TLSv1:SSLv3:SSLv2:!NULL:!EXPORT:!DES:!LOW:@STRENGTH After: (below is the Debian