Fix sendCommand line splitup

When sending a command it would be sent like this:
```
PKG1: 1 STARTTLS
PKG2: \r\n
```

Some mailservers don't accept commands across packets - they expect:
```
PKG1: 1 STARTTLS\r\n
```
I verified that using tcpdump:  http://hastebin.com/tavamepodi