Documentation bug: https://github.com/asterisk/asterisk/blob/master/configs/samples/voicemail.conf.sample#L350
attachextrecs is a misnomer. This option actually controls whether an email is sent at all when a recording is added to a mailbox using MixMonitor. It doesn't have anything to do with whether the recording is attached or not (I suppose if attachments are enabled, it may be attached as well, but it need not be). That is controlled by the regular "attach" setting.
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