The Mutt E-Mail Client : Reference : Configuration variables : dsn_notify
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## 6.3.39. dsn_notify

Type: string
Default: ""

Note: you should not enable this unless you are using Sendmail 8.8.x or greater.

This variable sets the request for when notification is returned. The string consists of a comma separated list (no spaces!) of one or more of the following: never, to never request notification, failure, to request notification on transmission failure, delay, to be notified of message delays, success, to be notified of successful transmission.

Example: set dsn_notify="failure,delay"

The Mutt E-Mail Client : Reference : Configuration variables : dsn_notify
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