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## 6 Server workarounds

Some SMTP servers have special requirements. The following variables implement support for common requirements.

`smtpmail-local-domain`

  The variable `smtpmail-local-domain` controls the hostname sent in the first `EHLO` or `HELO` command sent to the server. It should be set only if the `system-name` function returns a name that isn’t accepted by the server. Do not set this variable unless your server complains.

`smtpmail-sendto-domain`

  The variable `smtpmail-sendto-domain` makes the SMTP library add ‘`@`’ and the specified value to recipients specified in the message when they are sent using the `RCPT TO` command. Some configurations of sendmail requires this behavior. Don’t bother to set this unless you have get an error like:

              Sending failed; SMTP protocol error

  when sending mail, and the debug buffer (see Debugging)) contains an error such as:

              RCPT TO: someone
              501 someone: recipient address must contain a domain