RE: How to know the email size in marketing app
Hi ,
I do not know of a direct way to check within Dynamics, but there are 2 possible solutions to your problem:
A) Check the size of the HTML content: (at present the limit is at 100kb-128kb)
If you have a message that you suspect violates the HTML size limit, do the following:
- Open a web browser and enter a URL of the form:
https://<your_domain>/api/data/v9.0/msdyncrm_marketingemails(<email_id>)
Where:
The above documentation is taken from: Maximize email deliverability (Dynamics 365 Marketing) | Microsoft Docs
B) Increase your Email attachment size limit:
The default size limit for attachments is 5120kB/5MB but can be increased to 32768Kb/32MB and 131072Kb/128MB for depending on your version of CRM.
Go to Settings > Administration > System Settings.
In the Email tab, find "Set file size limit for attachments" and modify "Maximum file size (in kilobytes)" to the size limit you would require:

Hope this helps as a workaround.