Spam Filters Cost Republicans Millions, Study Finds
A new study suggests that Republican fundraisers may have lost around $117 million last year because email services, primarily Google, Microsoft, and Yahoo, wrongly marked their fundraising messages as spam while letting Democratic emails through.
This research, conducted by Dr. Cameron Ellis from the University of Iowa and Dr. Lars Powell from the University of Alabama, analyzed detailed Federal Election Commission (FEC) donation records. They differentiated between first-time and repeat donors through the GOP platform WinRed and its Democratic counterpart ActBlue, observing how donations fluctuated during two significant spam filtering periods last year.
The initial period stretched from June 30, 2025, when a GOP consulting agency, Targeted Victory, alerted Google to the spam issues with WinRed emails, up until September 15, 2025. During this time, Google halted the use of a spam blacklist, SURBL, which the researchers argue contributed to misclassifying these emails. In that span, first-time contributions to WinRed saw a drastic decline of 75% across Gmail, Outlook, and Yahoo. The second period happened between February and April of the following year, specifically affecting Outlook, where first-time donations plummeted by 83%. Altogether, these two episodes accounted for a loss of 142,126 expected first-time donations, translating to an estimated $117 million based on FEC data.
“That’s quite a significant figure,” Powell noted. He pointed out that this loss essentially acted as an unintentional donation to their political rivals. “You could view that as an in-kind contribution to recipients of ActBlue.”
Ellis and Powell emphasized that a decision made by a few email providers resulted in a noticeable and economically impactful decline in political fundraising. They elaborated that they could only observe this effect after some of the private testing details became public. Powell acknowledged the limitations of studying a system where companies don’t disclose much information. “We can’t read their minds,” he remarked, but he cited supporting evidence indicating that the filtering was indeed a result of how WinRed links were targeted.
After Google stopped using the SURBL on September 15, the email placement metrics for the GOP returned to normal.
For context, fundraising by the Republican National Committee (RNC), the National Republican Congressional Committee (NRCC), and the National Republican Senatorial Committee (NRSC) combined reached $377 million in 2025. Moreover, Gmail boasts over 3 billion monthly users.
In response, Google dismissed the study’s conclusions. A spokesperson criticized the research for flawed methods and claimed that the $117 million estimate is more of a theoretical figure than an actual one. They insisted their spam filters are applied impartially and encouraged bulk senders to adhere to best practices for inbox delivery. The spokesperson also stated that users retain full control over their inboxes, with options to mark messages as spam, block senders, or unsubscribe whenever they wish. Microsoft chose not to comment, while Yahoo did not respond to inquiries.
Previously, it was reported that Targeted Victory indicated in 2025 that Google was designating Republican fundraising emails as “dangerous.”
After discovering the issue that summer, Targeted Victory, which works with several prominent Republicans, performed tests by sending identical emails—only differing by inclusion of either a WinRed or an ActBlue donation link. The findings revealed that emails with WinRed links faced frequent flagging, whereas those with ActBlue links went through without issues.
In August, Google adjusted Gmail settings by implementing a new program allowing political campaigns and PACs to avoid spam filters, contingent upon adhering to certain policies. Powell noted he had not communicated with Google regarding the findings of the study, yet he speculated that the company’s motives may also be financially driven. “They profit from increased email traffic. If people’s behavior changes, that’s detrimental to their business model,” he said. He concluded by pondering whether Google’s actions lean more towards political bias or profit motives.
Bernadette Breslin, the press secretary for the NRSC, stated, “Google’s biased algorithms have sidelined Republican fundraising emails for years, while enhancing outreach for Democrats.” She remarked that the NRSC has been at the forefront of investigating Google’s suppression of conservative email communications and viewed the update as an opportunity to create a more equitable environment for online fundraising.
A GOP advisor familiar with the spam filter issue described the study as a significant validation of existing concerns, labeling it a “smoking gun” that confirms a troubling pattern.
