Virgin Media Community

[Vyper39]

For a little over a week, I have been unable to send emails via IMAP.NTLWorld.com using mobile data (android phone) on the O2 network. I receive an "unable to authenticate" error message. Oddly, I don't have this problem when connected to my home wifi, but do is connected to public wifi. 

This has been my primary account for many years and was working fine until recently.  My GMail account works fine via all data connections.  

Grateful for any advice on how to resolve this.

[用心棒]

Virgin Media use Spamhaus's dynamic lists to protect their SMTP servers from IP Addresses identified as sources of spam / malware. it is likely the IP Address O2 have assigned you is listed, to confirm this:

• browse to https://duckduckgo.com/?q=ip&ia=answer and note the Your IP address is value
• append the Your IP address is value to https://www.spamhaus.org/query/ip/ and go to it
  Example: if Your IP address value is 172.16.254.1 then you wound go to https://www.spamhaus.org/query/ip/172.16.254.1
• excluding the PBL, is it reported as listed elsewhere?
  
  do not post the results here without redacting your public IP address from text and underlying URLs

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[Vyper39]

Thank you for this.  No - my IP address is only listed in the PBL section

[Paul_DN]

Hi Vyper,

Thank you for coming back to us, apologies for the delay in answering, sorry can you tell us if the issue is ongoing, and if it is could you give us a bit more info about the public networks (is it always in the same place, or any public network?

Regards

Paul.