Follow the advice in the error message and file a report there:
As for the comand.
curl connects to a server using the appropriate protocol and can even be used to send a message.
curl - v gives us verbose mode
smtps:// is smtp over secure socket which happens over port 465 by default
smtp.virginmedia.com/ is the url
-u allows us to say we want to send a username and password if we don't put them in the command then we're asked for them before the command continues
"username:password"
All that makes up the first command.
curl -v smtps://smtp.virginmedia.com/ -u "username:password
HOWEVER this outputs everything to the command line. which can be a lot of data and includes the username and password. Which users have posted in the past. So we wanted to send all the output to the grep command using the | (pipe) character. We also need to send all the output to stdout so before we pipe it we use the redirect
2>&1 which directs any output from the error stream to the standard output stream
then we use | grep
I have found a slightly clearer way of specifying the search screen in Linux using greps -P switch (perl regular expression)
'<\s5\d\d\s|<\s4\d\d\s'
< = < as all messages from the server are indicated with this.
\s =space
5 = the character 5
\d = any digit
\d
\s
The | character in an expression means logical OR
So we then have
<
\s
4
\d
\d
\s
So the whole command runs the curl command and ONLY outputs line with '< 5xx ' or '< 4xx ' in them
curl -v smtps://smtp.virginmedia.com -u "username:password" 2>&1 | grep '<\s5\d\d\s|<\s4\d\d\s'
Here's a snip of the command in action. In my case the error is expected. For one thing I don't have a VM account any more.
