I apologize for the seemingly endless spew of duplicate emails from me
As far as I can tell it is a brokenness of some kind between Gmail and
Sourceforge SMTP. My best guess at the moment is that Sourceforge does
something that Gmail interpets as meaning "didn't make it, need to
resend later" -- when in fact the message was received and delivered
fine the first time.
...but since this interaction is between Gmail and Sourceforge, there
is relatively little I can do about it except file tickets...
Sorry for the inconvenience all around,