How to enable "Mailto" for a large number of recipients?

[TomLu1231]

Hi Expert, 

I am trying to create a button to launch the "Mail to".  The design concept is as below:

1. The user can select the people from a gallery and save it to a Collection called "GroupEmailRecipients" which has one column "EmailName".
2. Then the PowerApp will auto concat the Email into the "EmailA;EmailB;EmailC..." format.
3. Then the user can click the Button which will launch the "Mailto" so that the formatted addresses will auto populated in the Outlook and the user can start writing the Email content directly.  The formula used for the button is as below Launch("mailto:" & Concat(GroupEmailRecipients,EmalName & ";"))

 The formula works fine when the number is small. But the challenge I am facing is the number of recipients can be as large as 150. When the number of recipients are large, the formula will not be able to launch outlook. 

Is there any max number limitation on the Mailto? Or another solution to achieve the concept?

Many thanks!

Best regards,

Tom

[WarrenBelz · Accepted solution]

HI @TomLu1231 ,

The maximum number of recipients per message in Outlook is 500 - see this information.

Are you saying it is not working at 150?

[EvanTse · Accepted solution]

@TomLu1231 - It appears that the "Mailto" functionality has a character limit of about 2000 characters.

Is there any reason you can't use the outlook connector?

[WarrenBelz]

@TomLu1231 ,

I missed to "MailTo" reference in among the main issue you raised.

@EvanTse is correct in that you should use Office365Outlook.SendEmail, which should take 500 limit documented for Outlook.

[v-xida-msft · Accepted solution]

Hi @TomLu1231 ,

I agree with @EvanTse 's thought almost. Currently, there is a known limit with the Mailto protocol -- the maximum value of characters in "Mailto" protocol is 2000.

As an alternative solution, I think Office365Outlook.SendEmail() function could achieve your needs. On your side, please add Office 365 Outlook connection into your app, then take a try with the following formula:

Office365Outlook.SendEmailV2(
                           Concat(GroupEmailRecipients, EmalName & ";"),
                           "Subject",
                           "Body Content"
)

Best regards,

[JC14]

is there a solution for this on Power Bi?