I have been using Windows 7 and Windows Live Mail 2012 for many years. Outgoing settings have been as follows:
Outgoing mail: smtp-mail.outlook.com
Outgoing SMTP server: 587
Authentication required: This server requires a secure connection
However, with NO changes to the above, since a few days ago emails attachments, e.g. pdf files, have been failing with following error message:
An unknown error has occurred.
Subject 'Letter.pdf [01/12]'
Server Error: 554
Server Response: 554 5.6.1 Messages of type message/partial are not supported
Server: 'smtp-mail.outlook.com'
Windows Live Mail Error ID: 0x800CCC6F
Protocol: SMTP
Port: 587
Secure(SSL): Yes
The Message Delivery Failure message:
Delivery to the following recipients failed permanently:
* xxxxxxx@hotmail.com
Reason: This is the mail system at host know-smtprelay-4-imp.
I am sorry to have to inform you that your message, "Letter.pdf [01/13]", could not be delivered to xxxxxxx@hotmail.com.
The remote server returned the below error when attempting delivery:
554:554 5.6.1 Messages of type message/partial are not supported [BY2NAM03FT046.eop-NAM03.prod.protection.outlook.com]
I have tried turning off, "This server requires a secure connection", but that did not solve the problem.
Solution suggestions will be mightily appreciated, thanks.
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