Move the last bits still using boum.org for e-mail

We still use boum.org for e-mail in a few places:

Whisperback : tails#20577 (closed)
tails-support-private@
mails from icinga
Mailman lists
Change the SPF record at boum.org to say that it doesn't do email for Tails anymore

Let's move these to tails.net

Edited Oct 24, 2024 by groente

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