Mail command attachment not present

I am using the mail command that comes with OMV (Debian?) and it seems to miss the Attachment flag.

Usually Linux mail command comes with this flag

but in OMV's mail [-A] doesnt work and instead shows this:

usage: mail [-dEIinv] [-a header] [-b bcc-addr] [-c cc-addr] [-r from-addr] [-s subject] [--] to-addr ...
       mail [-dEIiNnv] -f [name]
       mail [-dEIiNnv] [-u user]

Quote

However, mail should work as well with -A

mail(1) — mailutils — Debian bullseye — Debian Manpages

Thats what I thought but that option doesn't exist on OMV's mail

I also cannot find a version number.

"man mail" also shows no option for attachments.

MAIL(1)                                       BSD General Commands Manual                                      MAIL(1)

NAME
     mail, mailx, Mail — send and receive mail

SYNOPSIS
     mail [-dEIinv] [-a header] [-b bcc-addr] [-c cc-addr] [-r from-addr] [-s subject] [--] to-addr ...
     mail [-dEIiNnv] -f [file]
     mail [-dEIiNnv] [-u user]

DESCRIPTION
     mail is an intelligent mail processing system which has a command syntax reminiscent of ed(1) with lines replaced
     by messages.

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I use s-nail to send mails with attachements.

s-nail(1) — s-nail — Debian bullseye — Debian Manpages

Thanks macom

s-nail works well, although s-nail -r "sender@domain.net" does not show the correct sender. This always gets overwritten by the sender-email configured in OMV's Notification settings.

How is it possible to use s-nail with "-r" ?