The pop3 module doesn't support pop over ssl (pop3s).
This patch adds support for a "-tls" option (must be boolean). The tls package should be present or it throws an error (I think this is the correct behaviour).
Being there, also corrects a mispelled error message ("Too" instead of "To")
attached diff file
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Adding a tentative pop3.man patch to document the new -tls option
File Added: pop3.man.diff
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Question: IIRC I have read somewhere that this patch was used to access gogle's gmail. Is that right? Can't seem to remember anymore where I read that.
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Another piece of code for the same/similar functionality is at http://wiki.tcl.tk/13352, by mic42.
And egavilan confirms on the Tcler's chat:
[09:17] emiliano and the response is yes: it's used to access gmail pops