#!/bin/sh -eu

F="$1"

rcpt="$(awk '
  match($0, /^(To|Cc|Bcc): (.*)$/, m) {
    split(m[2], tos, ",")
    for (i in tos) {
      print "--mail-rcpt " tos[i]
    }
  }
'  "$F")"

if grep -qE '^From: .*<addr@server1\.org>$' "$F"; then
  curl                                                      \
    -s                                                      \
    --url smtp://smtp.server1.org:587                       \
    --ssl-reqd                                              \
    --mail-from addr@server1.org                            \
    $rcpt                                                   \
    --user 'addr@server1.org:my-long-and-secure-passphrase' \
    --upload-file "$F"
elif grep -qE '^From: .*<addr@server2\.org>$' "$F"; then
  curl                                                      \
    -s                                                      \
    --url smtp://smtp.server2.org:587                       \
    --ssl-reqd                                              \
    --mail-from addr@server2.org                            \
    $rcpt                                                   \
    --user 'addr@server2.org:my-long-and-secure-passphrase' \
    --upload-file "$F"
else
  echo 'Bad "From: " address'
  exit 1
fi