I am having a weird issue with the forum notification emails. The emails are being sent out fine to Gmail, Yahoo addresses but the Hotmail email addresses (of students) are not receiving any email.
The email server and cron are working fine. I am not receiving any bounce back emails also.
I have the setting 'send as no-reply address' set to yes, so all emails are being sent with email@example.com with a reply-to address of the actual student. I changed that setting in the lib/moodlelib.php file. It's all working fine.
Except that Hotmail/Outlook/Live addresses are not receiving any emails. Please advice as to what might be the issue here so I could check it.
Thank you for your help.