I have checked the Do Not use SMTP pickup directory in the SMTP settings of our site. I am still getting this in the log:
[7/28/2020 9:41:25 AM]: Send using Pickup Directory Service failed. Trying SMTP protocol.
[7/28/2020 9:41:27 AM]: Mail sent successfully using SMTP protocol. Recipients: 'firstname.lastname@example.org' - CC Recipients: - BCC Recipients:
Is that expected behavior?