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option.
(smtpmail-via-smtp): Print warnings about unknown SMTP extensions
only if smtpmail-warn-about-unknown-extensions is set.

automatically appending a domain to RCPT TO: addresses.

for queued mail safe on Windows (`:' is invalid in file names on
Windows).

smtpmail-code-conv-from properly.
(smtpmail-send-data-1): If DATA is a multibyte string, encode it
by smtpmail-code-conv-from.

after switching buffer, as case-fold-search is a buffer local
variable.

(smtpmail-address-buffer): Add defvar.
(smtpmail-recipient-address-list, smtpmail-read-point): Likewise.

on extension lines.

(smtpmail-via-smtp): Check that smtpmail-smtp-server is defined.

(smtpmail-deduce-address-list): Changed the search for
Resent-\(To\|Cc\|Bcc\) headers.
(smtpmail-do-bcc): Delete Resent-Bcc: headers.

(smtpmail-queue-dir, smtpmail-queue-index-file): New variables.
(smtpmail-queue-mail): New variable.
(smtpmail-send-it): Handle those variables.
(smtpmail-send-queued-mail): New command.

VERB and XONE as a synonym for ONEX.

(smtpmail-read-response): Add "%s" to `message' calls to avoid
problems with percent signs in strings.

(smtpmail-read-response): Return all lines of the
response text as a list of strings.  Formerly only the first line
was returned.  This is insufficient when one wants to parse
e.g. an EHLO response.

Ignore responses starting with "0".  This is necessary to support
the VERB SMTP extension.

(smtpmail-via-smtp): Try EHLO and find out which SMTP service
extensions the receiving mailer supports.

Issue the ONEX and XUSR commands if the corresponding extensions
are supported.

Issue VERB if supported and `smtpmail-debug-info' is non-nil.

Add SIZE attribute to MAIL FROM: command if SIZE extension is
supported.

Add code that could set the BODY= attribute to MAIL FROM: if the
receiving mailer supports 8BITMIME.  This is currently disabled,
since doing it right might involve adding MIME headers to, and in
some cases reencoding, the message.

any line of data, not just lines containing nothing else.

Delete code that converted "S:" to "Subject:".
Insert FROM field unless it already exists (code from sendmail.el).

(smtpmail-send-it): Require mail-utils upon entry.
Don't invoke sendmail-synch-aliases.
(smtpmail-deduce-address-list): Only use text matched in regexp group,
not the whole regexp.

(smtpmail-deduce-address-list): Bind recipient-address-list with let.
(smtpmail-via-smtp): Bind greeting, n, process-buffer.