Emails sent in client Windows Live Mail 2012, whilst going into sent folder, are not being received by recipients unless there is an attachment.
I have checked that sending emails, whether with or without attachments, direct in service provider's email page does work so this would point to a Live Mail being source of problem.
I have not changed any settings in Live Mail. I did do some maintenance work such as deleting newsfeeds quite recently.
I would appreciate some help to solve this problem.