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Send auto reply email on receiving first email on shared mailbox with Unique Number (starting from 1 to infinity)

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Posted on by npatel5

I am trying to create an automated cloud flow that generates an auto-reply email when receiving the first email to a shared mailbox.
Auto-reply email will be sent to the sender on their first email with a uniquely generated reference number starting from 1- infinity.

Issue: I am not able to generate an incremental unique reference number for every first email received. I have attached the flow I have created. Any help is appreciated.

Expected Output:

Example1 : Auto Reply Email body- "Thank you for contacting the ABC Mailbox. Here is your unique reference number :1. We will be in contact shortly regarding your query. Thanks"

Example2 : Auto Reply Email body- "Thank you for contacting the ABC Mailbox. Here is your unique reference number:2. We will be in contact shortly regarding your query. Thanks"

Image-1Image-2

Any help is appreciated.

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VictorIvanidze 12,509 on at

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Re: Send auto reply email on receiving first email on shared mailbox with Unique Number (starting from 1 to infinity)

Use GUID function.
npatel5 2 on at

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Re: Send auto reply email on receiving first email on shared mailbox with Unique Number (starting from 1 to infinity)

I need an "autoreply" sent out from our team mailbox to anyone's first email sent into the mailbox. It would include a unique reference number going from 1-infinity. Reference Number should be incremental for each email sent,
eg- 1,2,3,4,5,....
The reply we need automated would be something like "Thank you for contacting the ABC Mailbox. Here is your unique reference number. We will be in contact shortly regarding your query. Thanks".

How should I generate unique reference number?
ManishSolanki 15,085 Super User 2025 Season 1 on at

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Re: Send auto reply email on receiving first email on shared mailbox with Unique Number (starting from 1 to infinity)

Hi @npatel5

I would suggest you to please use SharePoint list to store the email sender info. Use 'Create item' action to create a new item in the list and use the auto generated ID column of the new list item in the respond email.
As an example, pls refer the below flow:

if this helps & solves your problem, please remember to give a 👍 and accept my solution as it will help others in the future.

Thanks