send email
- help
```shell
$send-mail --help
Usage: send-mail [OPTIONS] --subject --body
Options:
-s, --smtp-server
smtp server host
-u, --username
smtp username
-p, --password
smtp password
-f, --from
from [name:email] (name:xxx@xxx.com)
-t, --to
to [name:email|name:email|..] (name1:xxx1@xxx.com|name2:xxx2@xxx.com|...)
--subject
--body <BODY>
body
--body-html <BODY_HTML>
html body
-a, --attachment-file
attachment file path
-h, --help
Print help
```
- env
```shell
export SMTPSERVER=smtp.xxx.xx
export MAILUSERNAME=xxxxxx
export MAILPASSWORD=xxxxxx
export MAILFROM=name:xxx@xxx.com
export MAIL_TO=name1:xxx1@xxx.com|name2:xxx2@xxx.com|...
send-mail --subject "subject" --body "body" --body-html "
body html
" --attachment-file attachment-file
```