it is a series of options from ssmtps "sendmail" manpage
Most sendmail options are irrelevent to sSMTP. Those marked ``ignored'' or ``default'' have no effect on mail transfer. Those marked ``unsup- ported'' are fatal errors. Those marked ``simulated'' are not errors, but the result is for the program to exit with an informative message. A sort of fatal non-error. ............. -oAfile (ignored) Use alternate alias file. -oc (ignored) Delay ``expensive'' connections. -od (ignored) Set the delivery mode to interactive/synchronous, background or queue (Always interactive). -oD (ignored) Run newaliases if required. -oe (ignored) Set error processing to mail, write, print or quit. (Always print). -oFmode (ignored) The mode to use when creating temporary files. -of (ignored) Save UNIX-system-style ``From'' lines at the front of messages. -ogN (ignored) Set group ID to use when calling mailers. -oHfile (ignored) Set SMTP help file. -oi (default) Do not take dots on a line by themselves as a message terminator. -oLn (ignored) The log level. -om (default) Send to ``me'' (the sender) also if in an alias. -oo (unsupported) If set, this message may have old style headers. -oQqueuedir (ignored) Select the directory in which to queue messages. -ortimeout (ignored) The timeout on reads. -oSfile (ignored) Save statistics in the named file. -os (ignored) Always instantiate the queue. -oTtime (ignored) Set timeout on messages. -otstz,dtz (ignored) Set the name of the time zone. someone familiar with getopt will be required to provide a patch for nbsmtp that provides similar functionality. -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 268.18.17/730 - Release Date: 22/03/2007 07:44