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a/Allura/allura/lib/mail_util.py b/Allura/allura/lib/mail_util.py
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            message['In-Reply-To'] = Header(in_reply_to, charset)
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            message['In-Reply-To'] = Header(in_reply_to, charset)
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        content = message.as_string()
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        content = message.as_string()
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        smtp_addrs = map(_parse_smtp_addr, addrs)
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        smtp_addrs = map(_parse_smtp_addr, addrs)
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        smtp_addrs = [ a for a in smtp_addrs if isvalid(a) ]
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        smtp_addrs = [ a for a in smtp_addrs if isvalid(a) ]
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        if not smtp_addrs:
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        if not smtp_addrs:
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            log.warning('No valid addrs in %s, so not sending mail', addrs)
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            log.warning('No valid addrs in %s, so not sending mail',
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                        map(unicode, addrs))
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            return
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            return
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        try:
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        try:
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            self._client.sendmail(
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            self._client.sendmail(
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                config.return_path,
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                config.return_path,
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                smtp_addrs,
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                smtp_addrs,