While you are correct that the Fourth Amendment prohibits general warrants, most of the government's searches of emails are by way of administrative subpoena. The government only needs a warrant to obtain unopened emails sent within the last 6 months. 18 USC § 2703 http://www.law.cornell.edu/uscode/text/18/2703
The New York Times recently published an excellent article about the ease with which the Government can access private electronic communications, and the limited precautions we can take to keep our information private:
"The Fourth Amendment requires the authorities to get a warrant from a judge to search physical property. Rules governing e-mail searches are far more lax: Under the 1986 Electronic Communications Privacy Act, a warrant is not required for e-mails six months old or older. Even if e-mails are more recent, the federal government needs a search warrant only for 'unopened' e-mail, according to the Department of Justice’s manual for electronic searches. The rest requires only a subpoena.
Google reported that United States law enforcement agencies requested data for 16,281 accounts from January to June of this year, and it complied in 90 percent of cases."
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There's no way to give a simple, pat answer to a question like this in the limited space here. It will depend upon the nature of the search - what is it that's being searched? a criminal defendant's email account? a third party's? Is it based on disclosures by the recipients of the email (in which case, the defendant has no expectation of privacy at all, and it's not even a "search"), or upon an attempt to 'hack into' someone's account (which would be a search, and would be illegal if not conducted with a proper warrant)? You need to consult with a criminal defense attorney in private if this is going to be an issue for you.
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Your question is interesting, but over-broad for the Avvo forum. There have to be websites dedicated to the issue.
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It may also depend on what email is involved. For instance, and employee may not have a privacy right in email generated on the employer's computer.
This comment is general in nature and is not intended as legal advice. It does not create an attorney client relationship and obviously is not confidential. You should contact an attorney in your area who can review with you all of the relevant facts and give you specific legal advice.