After upgrading, I noticed all backups were running fine but notification mails where no longer sent. It appears Alpine linux mail command do not support the -S option to provide an external mailserver.
/ # cat /var/log/mail-last.log
mail: unrecognized option: S
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]
After upgrading, I noticed all backups were running fine but notification mails where no longer sent. It appears Alpine linux mail command do not support the -S option to provide an external mailserver.
/ # cat /var/log/mail-last.log mail: unrecognized option: S 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]
msmtp is an alternative.