The scenario described an Emirati diplomat facilitating communication between

 the Trump administration and Iran's foreign minister—aligns with known diplomatic efforts during Donald Trump's presidency, though specific details require context:

1. **Historical Context**: 

   - **Trump's Iran Policy**: The Trump administration pursued a "maximum pressure" campaign, withdrawing from the JCPOA (2015 Iran nuclear deal) in 2018 and imposing sanctions. Despite this, there were sporadic attempts at dialogue, including a reported letter from Trump to Iran’s Supreme Leader Khamenei in 2019 (delivered via Swiss intermediaries), urging negotiations.

   - **UAE's Mediating Role**: The UAE, despite tensions with Iran, has historically acted as a regional mediator. In 2019–2020, Emirati officials reportedly helped de-escalate U.S.-Iran tensions, including during the 2019 Gulf crisis and the 2020 Soleimani aftermath.

2. **Key Figures**:

   - **Emirati Diplomat**: Ambassador Yousef Al Otaiba (UAE’s envoy to the U.S.) has been central to backchannel diplomacy. His involvement in regional issues, including the Abraham Accords (2020), suggests potential intermediary roles.

   - **Iran’s Foreign Minister**: Javad Zarif (in office until 2021) was Iran’s primary diplomatic figure during this period. Direct meetings with U.S. allies would be rare but not impossible, given Iran’s interest in sanctions relief.

3. **Purpose of the Letter**: 

   - Such a letter might have outlined demands (e.g., nuclear concessions), warnings, or offers for talks. Trump’s 2019 letter to Khamenei, for instance, combined threats with invitations to negotiate.

4. **Plausibility and Challenges**:

   - **Third-Party Diplomacy**: The UAE has facilitated U.S.-Iran communication before, including prisoner swaps and maritime security talks. However, direct delivery of a presidential letter via the UAE is not widely documented.

   - **Iran’s Stance**: Iran historically rejected talks with the U.S. under Trump unless sanctions were lifted, complicating the likelihood of publicized high-level meetings.

5. **Outcome**: 

   - No major breakthrough resulted from such efforts during Trump’s term. However, backchannel talks may have laid groundwork for later engagements, such as indirect negotiations in 2021 under the Biden administration.

**Conclusion**: While there is no widely confirmed instance of an Emirati diplomat delivering a Trump letter to Iran’s foreign minister, the UAE’s role as a mediator and Trump’s episodic outreach to Iran make the scenario plausible within the complex diplomatic landscape of the time. Such efforts would reflect attempts to de-escalate tensions or explore negotiated solutions, albeit with limited public transparency.