Thanks for your replies. I have not had time yet to act on them in detail yet but just a few points. My mobile phone is a San Francisco running Android with a giffgaff SIM that uses O2 network I think. I use Linux Mint 16 on my desktop machine and Ubuntu 10.04 LTS on a Sony laptop but as gmail is web mail I cannot see that this matters.
Doing a google search I came across this web site:- http://arstechnica.com/security/2014/03/10000-linux-servers-hit-by-malware-serving-tsunami-of-spam-and-exploits/ which states "10,000 Linux servers hit by malware serving tsunami of spam and exploits Two-year-old Windigo may also have infected kernel.org Linux developers ......." I do not know if this has any connection? I am off to change my gmail password and see if I can contact google about it. Clive Woodfine
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