🚀: Allow the use of the From header instead of the envelope for vacation scripts

[eprovst]

Which feature or improvement would you like to request?

Ideally, I'd like to see a configuration option where one can configure the sieve vacation command to use the From-header as To instead of the envelope from.

Is your feature request related to a problem?

When the email sever is downstream of a forward chain (e.g. external anti-virus or an SMTP proxy) the envelope from is often fairly unrelated to the original message, which breaks out of office messages.

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