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Featured Image Credit: Instagram/orgill1234
Laura Orgill has amassed more than 800,000 followers on the platform, sharing videos of herself out and about while delivering letters and parcels.
However, she said her bosses have decided that, when she's on the clock, she needs to stick to posting mail - rather than videos on TikTok.
The 27-year-old, from Rhondda, South Wales, explained: "So a lot of you are wondering, why am I not posting in my uniform or at work anymore, and I'm going to explain everything next.
"So unfortunately, moving forward, Royal Mail have decided that they no longer want me to post in my uniform anymore, or discuss anything to do with Royal Mail.
"I am absolutely heartbroken - that is how I started this journey, as TikTok postie."
And while Laura might be gutted that this chapter in her life is coming to a close, she understands why her employer has decided enough is enough.
She continued: "Unfortunately the more I grew on here [TikTok] then I am going to have people who don't like me, and it isn't fair on Royal Mail for people just to be ringing up, having hundreds of complaints about me day in, day out, over nothing.
"So I think it's best for both Royal Mail and me to just stop doing content at work and just concentrate on content in my own time."
A spokesperson for Royal Mail told LADbible: "While we would not comment on any individual, Royal Mail operates a clear policy with regards to posting under the Royal Mail brand on social media."
Laura faced a backlash in July when she shared a video in which she joked about posting 'we missed you' notices through people's letterboxes 'when they take longer than two seconds to answer the door'.
The video racked up 3.6 million views and a lot of people didn't see the funny side.
One TikTok user commented: "When you are wheelchair bound and can't rush to the door and they force you to collect the package three miles away."
Another added: "I know it's a joke but it doesn't look good on the company, I'd never post in uniform, wouldn't surprise me if [she gets a] disciplinary."
In response to the backlash, Laura shared another clip in which she tearfully explained that the post was a 'joke' and she only intended to 'spread positivity'.
She said: "I'm very upset about the situation. All I did was use a trending sound and think of a funny scenario that people think that posties do to match the sound and unfortunately people have taken it seriously.
"All I've tried to do is use my platform to spread positivity and fun during such uncertain times which has now led to me being upset - all through the last year I used my platform for good."