Ensure that user-mail-address always has a value
* lisp/startup.el (user-mail-address): Initialize in the normal way. (command-line): Reset user-mail-address if needed using standard custom machinery. * lisp/mail/feedmail.el (feedmail-fiddle-from): * lisp/mail/rmail.el (rmail-unknown-mail-followup-to): * lisp/mail/rmailsum.el (rmail-header-summary): Simplify now that user-mail-address is always set. ; * doc/lispref/os.texi (System Environment): Remove fixme comment.
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