@Celso Sotomarino Thanks for reaching out to Microsoft Q&A, apologize for any inconvenience caused on this.
- When you deploy
Wordpress on App service
from Marketplace it interns create an Azure communication email service and provisions a managed domain as well. Are you using that managed domain to send email or have you created a new managed domain & ACS resource? - If you are using the default create managed domain, can you check the below values.
- Check whether value of app setting
WP_EMAIL_CONNECTION_STRING
is correct or not. - Right managed domain is associated with the communication service that is linked to app service.
- Make sure the from address that you are using in your email action is same with the email address that present in
Mail from address
under Email Services of your email service domains as shown below.
If the above values are correct and you are still facing the issue. please send an email with subject line “Attn:Venkatesh |" <title of this thread> to AzCommunity@microsoft.com referencing this thread with your Azure subscription ID, webapp name, ACS details, I will follow-up with you.