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E-Mail sent from desktop client OK but from web application rarely delivers to hotmail/outlook

I'm using the Workspace E-Mail account (info@domain.com).

My web hosting plan is a Plesk Shared hosting.

Followed this instructions to send the e-mail from the app: https://www.godaddy.com/help/send-email-using-systemnetmail-19291

 

The problem is that the mails that the app sends are very rarely delivered to hotmail/outlook, apparently I can send 1 mail per day, but not sure if is a coincidence (the app is simplified to test purposes, I have a test action that the only thing does is send the mail and ensure to catch and show any error). No error is thrown. Obviously I checked the spam folder and rules on the destination.

 

But I configured that same account (info@domain.com) on desktop client (thunderbird) following the configuration instructions on the workspaces console. And using that client the mail delivers almost instantly and without any limit/problem to outlook/hotmail.

 

What is happening? the only difference is the SMTP server used in both cases, but inside the app I cannot use the same SMTP server that on desktop client because ir rejecting to connect to it from the hosted app (apparently a intentional restriction).

 

What can I do to solve this?