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NTLWorld email server not accepting outbound emails from 02 android phone via mobile data

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.

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Re: NTLWorld email server not accepting outbound emails from 02 android phone via mobile data

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:

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Re: NTLWorld email server not accepting outbound emails from 02 android phone via mobile data

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

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