If you successful authenticated yourself to the SMTP server you will see something similar to:
⋮ < 235 2.7.0 ... authentication succeeded > HELP < 214-2.0.0 This is cmsmtp ESMTP service help 214-2.0.0 This is cmsmtp ESMTP service help < 214-2.0.0 To contact postmaster send email to firstname.lastname@example.org. 214-2.0.0 To contact postmaster send email to email@example.com. < 214-2.0.0 For local information send email to Postmaster at your site. 214-2.0.0 For local information send email to Postmaster at your site. < 214 2.0.0 end of HELP info 214 2.0.0 end of HELP info * Connection #0 to host smtp.virginmedia.com left intact
however if not you will see: ⋮ < 535 5.7.8 Authentication Credentials Invalid (VM300) * Closing connection 0 curl: (67) Login denied What VM code do you see; in the example above it is VM300? Please do not be tempted to post more than the requested curl output as you will likely reveal your email address and password."
Can yoou report the error back if you get VM305 then you have a problem that something on your home network is sending spam and will need to follow
You can check your listing yourself but there is no point requesting removal until you have found and deleted the spambot. https://www.spamhaus.org/query and type in your external IP you can gets this my typing "whats my ip" into google.
If you are running Hola VPN Free, then note But Hola Free VPN is anything but a VPN.
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If you are having trouble sending mail, then the curl command he posted does give useful information. However it might be better to use the following command which will ONLY give us the success or fail result.