setting /var/mail permissions permanent to 1777 in ZFS

I installed FreeBSD 13.1-STABLE recently and use mail/alpine for mailing. Alpine wants /var/mail to have 1777 permissions set. But after every reboot permissions are set back to 0775. I think that's because ZFS has some setting somewhere with the dataset permissions which are set at boot time.

So does anyone know how I can set the permissions of /var/mail permanent to 1777?

Thanks in advance.
 
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