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# Sendmail

```
apt install sendmail
```

## config

  - change first line of `/etc/hosts` to:\
    `127.0.0.1 localhost.localdomain localhost backup`\
    ("backup" is the hostname. Get it with: $ hostname
  - config\
    `sudo sendmailconfig # answer "Y" to everything`

## custom "from: " address

in order to have a custom "from: " email address (instead of `user@localhost.localdomain`) do the following:

  - create file `/etc/mail/genericstable`
  - add following content:
    ```
    user       notifications@docuteam.ch
    root       notifications@docuteam.ch
    ```
  - create `genericstable.db`\
    `makemap hash /etc/mail/genericstable < /etc/mail/genericstable`
  - modify `/etc/mail/sendmail.mc`\
    add following lines right before `MAILER_DEFINITIONS`:
    ```
    FEATURE(`genericstable')dnl`
    GENERICS_DOMAIN(`localhost.localdomain')dnl
    ````
  - macro erstellen\
    `m4 sendmail.mc > sendmail.cf`
  - restart sendmail service\
    `systemctl restart sendmail.service`
  - test mail\
    `echo "Subject: sendmail test 1" | sendmail -v r.rutishauser@docuteam.ch`