I have tried with plain, SSL and TLS authentications. Before Office365 I worked with various different mails and it worked without problems, now it doesn’t.
Hi @vvucic Finally I found something useful. The php error says “SMTP Error: data not accepted.” After some more digging into it I found out that the problem is within OJS as when sending email the from and reply to email addresses are not the same and Office365 refuses it.
Thank you for your help.
The point is there is no ‘my’ Office365, I am using MS cloud version, so not the case.
Further on I have found out that if:
a user has the same email address that OJS is using for SMTP, it works
a user has any other email address it doesn’t work
Beside that I have found some explanation on the WEB that can be the case. So I am concluding that is it.