JCmacc wrote:
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One diagnostic site tells me the blacklisting is due to a change being needed by the ISP. The message is below.
"This IP has been flagged because it is dynamic or by suspect to be domestic use only.
If you are running an email service on this IP, ask ISP to change the rDNS
You are using an email client (Outlook) to send via Virgin Media's email server. You are not running an email server so the above blacklisting is not relevant.
Check that your email client is using the recommended setting as detailed here, Email settings change - Virgin Media Community - 3369438
Should the issue persist then It would be helpful to see what, if any, error code is returned by the SMTP server when sending. From a desktop or laptop device open a Command Shell in Window or otherwise the Terminal. app and enter the following where username:password is replaced with your email address and password, i.e. richard.branson@virginmedia.com:Y54kpX5g:
curl -v smtps://smtp.virginmedia.com -u username:password
WARNING: Do not post the resulting output here but instead review it for possible reported causes, i.e. VM error code; choosing to ignore this warning and posting the output here unredacted or incorrectly redacted will likely reveal your email address, password and / or public IP Address.
FYI if there is no issue then you should see the following output from the curl command:
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> AUTH PLAIN
< 334
> [Redacted]
< 235 2.7.0 SMTP350 Authentication successful for user [Redacted]
> 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 postmaster@virginmedia.com.
214-2.0.0 To contact postmaster send email to postmaster@virginmedia.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
Otherwise unsuccessful will look similar to the following; note VM error code VM320 in result:
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> AUTH PLAIN
< 334
> [Redacted]
< 525 5.7.13 Authentication Denied (VM320)
* Closing connection 0
* TLSv1.2 (OUT), TLS alert, close notify (256):
curl: (67) Login denied
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