* gnus-art.el (article-verify-x-pgp-sig): Don't use

* gnus-art.el (article-verify-x-pgp-sig): Don't use
`insert-buffer', the docstring says "This function is meant for
the user to run interactively.  Don't call it from programs!"

* mm-extern.el (mm-extern-mail-server): do.

* mml1991.el (mml1991-mailcrypt-sign, mml1991-mailcrypt-sign)
(mml1991-gpg-sign, mml1991-gpg-encrypt, mml1991-pgg-sign)
(mml1991-pgg-encrypt): do.

* pgg.el (pgg-decrypt-region): do.

* mm-view.el (mm-view-pkcs7-decrypt): do.

* mml-smime.el (mml-smime-verify): do.

* mml.el (mml-insert-mime, mml-preview): do.

* mml2015.el (mml2015-gpg-decrypt-1, mml2015-gpg-sign)
(mml2015-gpg-encrypt, mml2015-pgg-clear-decrypt)
(mml2015-pgg-encrypt): do.