If you need to flush a Mac's DNS cache, the following line will be helpful:
sudo dnscacheutil -flushcacheMonthly Archives: October 2010
Flush OS X’s DNS Cache
Posted by digo on October 23, 2010
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OpenSSL Telnet Check
Posted by digo on October 3, 2010
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As an example:
openssl s_client -connect imap.gmx.de:993 -quiet