As many as 4.25 million Gmail users were turned into unintentional spammers due to a glitch in Gmail's system.

Despite assurances from Google team members that the problem has been fixed, Gmail users continue to post reports to the contrary.

Gmail user reports of messages being resent many times and other mail errors began trickling into the Gmail Help Forum as early as last Saturday, reaching a peak on Tuesday. On Wednesday, Google alerted its customers that the company was experiencing an issue affecting less than 2.5 percent of the Google Mail user base

While Google does not break out user figures, the company indicated with the launch of Buzz in February this year that around 170 million people are using Gmail.

Affected users found their emails were being re-sent multiple times, some over several days. Some reported they were blacklisted as spammers and prevented from sending any email. Their first clues came in the form of "bounce-back" emails from the destination domain to which they were trying to deliver mail.

A Google team member reported the issue had been resolved at 10:27 pm PST, Thursday evening. However, reports are still coming in from Gmail users like this one at 7:40 am Friday morning:

"I have been warned by many contacts that they have received from my Gmail account the same message several times. This has been causing some trouble to me, since I work in a university and e-mail is my #1 means of communication. What can I do to solve this problem?" Vetromillecastro, a Gmail user posted.

Gmail is the third most popular email service behind top-ranked Yahoo Mail and second-ranked Windows Live Hotmail, according to Hitwise analysis Google limits its users to 500 email recipients per day.

Google's Apps Status dashboard today reports no issues with Google Mail.