GUI version GNU Emacs 220.127.116.11 (x86_64-pc-linux-gnu, GTK+ Version 3.16.7) of 2015-11-02, from emacs-snapshot.
Linux Ubuntu distrubition
Gnus version 5.13
I switched to Linux, to be able to read my own mail.
When I'm reading my mail, I would like to reply it.
When I type my answer in the message window, and I send it with C-c C-s, I get the error messages:
Sending... Sending via mail... let*: Cannot infer SMTP information.
When Googling around, it seems none had stumbled this issue earlier. I found only the contents of the Lisp code that produces this error message. It seems my SMTP is unknown to Gnus.
But how could I solve it? Gnus seems to have access to my Gmail.