In my firm there are 5 PCs' Windows 10 updated and with Outlook 2013/2016 updated that successfully send e-mail (that is what Outlook shows), but they are not delivered to addresses that are not in their domain (See Example1). But it works as aspected in one PC, although it has the same network and e-mail configuration as the others. The e-mail is successfully sent if I use the brownser version of the email.
Exemple1: our e-mail domain is X, we successfuly send an email to an email in the domain X, but if we try to sendo to domain gmail.com it is not delivered, although Outlook says it was sent successfuly.
Thanks for any help!
I deleted and created again the e-mail account on Outlook, then it worked. Let's hope it doesn't happen again. I'll not post as finished because I'll test for a month and if it still works I'll finish this post.