BBC News Story 13 April.
Gmail, the planned free e-mail service from Google, could be facing strong legal opposition in California
A draft law is being drawn up by local Democratic Senator Liz Figueroa, who calls Gmail "an invasion of privacy".
Google is being asked to rethink the product, which plans to offer 100 times the storage offered by some rivals.
The problem, Ms Figueroa says, is Google's plan to make revenue from users agreeing to their incoming e-mail being scanned for targeted advertising.
Objections
Californian Senator Figueroa describes the service as being a bit like "having a massive billboard in the middle of your home".
The targeted adverts would use key words after scanning your private e-mail - posting adverts for pharmaceutical products, for example, if a message mentions a medical condition.
Google's plans have already come under fire from privacy campaigners objecting to adverts linked to the content of messages, and to the permanent storage of email.
UK-based campaign group Privacy International has complained to the UK's Information Commissioner about Google's plans to send users links to advertising based on a computer scan of their correspondence, and presumed interests.
It also pointed out that Google's terms of service did not allow users to delete their emails permanently, despite European data protection legislation which gives users full control over their own communications.
Current practice
At present, users of Google's internet search engine receive advertisements for commercial sites linked to their search topic arranged down the right-hand side of their screens.
Gmail would use similar technology to scan emails and offer advertisements.
Other websites - including rivals such as Yahoo - use similar methods to select which banner adverts appear on top of a search page.
Google said in a statement that it intends to work with data protection authorities across Europe to ensure concerns are resolved.
It says the content of users' email would remain private because the process would be fully automated.
The internet search engine company has promoted free storage for each user of the equivalent of 500,000 pages of email among Gmail's benefits.
Google says this will enable users to retrieve vast amounts of old emails, and that it will back this up with superior spam filtering.
Google is privately-owned, but expected to float on the stock market later this year, a deal that could value Google at up to $25bn (£14.7bn) - slightly more than listed online retailer Amazon.
The California-based company was founded in 1998 by Larry Page and Sergey Brin.
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