Your settings look fine. If you have set the to and from appropriately in the Epi Form settings tab. Only thing I can think of is the emails going in spam probably. There is no reason for one email working and other one not.
This may help: https://world.episerver.com/documentation/developer-guides/forms/implementing-a-customized-actor/email-actor/
I have created a form that is set up to send an email to a fixed email address and also to send a confirmation email to whoever submitted the form. The user's email address is an input field in the form itself.
We are using SendGrid. I confirmed that the recipient receives the form submission email successfully. However, the submitter never gets a confirmation email even if it is set up within epi.
Any ideas as to how I can get the submitter to receive a confirmation email as well? Anyone has the same issue?
Note that I have tried ports 587 and 465 with same results.
<network host="smtp.sendgrid.net" password="[API key generated in management portal]" userName="[generated in management portal]" port="587" />