How can I make GNU mailutils to use an external SMTP server?

Does anybody on this planet know what the equivalent GNU mailutils command to the following looks like? Is this even possible without a local MTA with mailutils? Using s-nail it works as intended. ```bash s-nail -s "$subject" -S $smtp_server -r $from_user $to mail: Cannot open mailer: Input/output error \ > mail: cannot send message: Input/output error this is not a duplicate of [can-i-set-up-system-mail-to-use-an-external-smtp-server](https://unix.stackexchange.com/questions/36982/can-i-set-up-system-mail-to-use-an-external-smtp-server) as they used a local MTA or heirloom-mailx or s-nail or other tools. I am using Debian.