Microsoft employees are concerned that the company has been blocking Outlook emails containing the words "Palestine," "Gaza," "genocide," "apartheid" and "IOF off Azure," even if they're including those terms in an HR complaint, according to screenshots, recordings and documents viewed by CNBC.
Employees said they started noticing the change Wednesday just before noon PST, batch-testing emails with the terms in question and emails without them. Only the ones without such terms appeared in their outboxes, suggesting those containing the terms weren't received, according to materials viewed by CNBC and three sources familiar with the matter.
The people asked not to be named in order to speak freely.
One employee with the word "apartheid" in their email signature, who spoke on condition of anonymity for fear of retaliation, said they sent a typical work-related email around 11:30 a.m. PST on Wednesday successfully. The person said that just before noon on the same day, their emails wouldn't go through -- ostensibly due to their email signature.
On internal message boards, messages seen by CNBC showed employees asking why their emails with the word "Israel" may go through but not the word "Palestine," as well as "Gaza" and other terms. Modifications like "P4lestine" did go through, according to their tests.
One employee asked on an internal message board, "Is the company abandoning the inclusivity initiative or is this only targeting Palestinians and their allies?"
The Verge was first to report on the potential email block.
In a message seen by CNBC, Frank Shaw, Microsoft's chief communications officer, responded to an employee post, writing: "To clarify, emails are not being blocked or censored, unless they are being sent to large numbers of random distribution groups. There can be a small delay and the team is working to make that as short as possible."
"Over the past couple of days, a number of emails have been sent to tens of thousands of employees across the company and we have taken measures to try and reduce those emails to those that have not opted in," a Microsoft spokesperson said in a statement.
But employees told CNBC that even when they attempted to send relatively mundane, solely work-related emails to small groups of colleagues, the emails still didn't go through if they contained those terms.
Another employee who spoke on condition of anonymity said that when they attempted to send a report to HR containing one of the terms in question, they did not receive the auto-response typically confirming receipt until more than 24 hours later. The message also didn't show up in the online HR portal until more than 24 hours later.
Some emails were delivered after being delayed by seven hours or more, according to the group No Azure for Apartheid. The group suggested manual reviews of such emails were taking place before they were delivered.