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no_ssl - Start with no SSL support
no_uidl - Start with no UIDL support
bad_resp - Send a non-RFC compliant response to the Client
bad_cap_resp - send a non-RFC compliant response when the Client sends a 'CAPABILITY' request
bad_login_resp - send a non-RFC compliant response when the Client sends a 'LOGIN' request
deny - Deny the connection
drop - Drop the connection after sending the greeting
bad_tls - Send a bad response to a STARTTLS
timeout - Do not return a response to a Client request
to_deferred - Do not return a response on a 'Select' request. This
will test Deferred callback handling
slow - Wait 20 seconds after the connection is made to return a Server Greeting
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