Microsoft integration - sending email from System Mailbox takes 20-30 sec.

[beltoftandersen]

Summary
After changing version from 4.2.8 to 5.0 sending an email from the Mailbox through Microsoft integration takes 20-30 seconds. On 4.2.8 it was 3-4 seconds.
Tried with a completely fresh installation, same result.

Steps to reproduce
Setup the Azure Active Directory Application Settings under the Microsoft integration.
Setup a System Mailboxes and connect to Office 365.
Send email using System Mailbox.

Actual Result
Email sent, but it takes 20-30 seconds

Expected Result
3-4 seconds

Details about your environment

• OroCRM version: 5.0
• PHP version: 8.1
• Database (MySQL) version: 8.0.32