@edoardovonwhat
X-Priority: 1 = High Priority, not Emergency. When you look at the options in Outlook you have Low, Normal, and High. Directly from Microsoft's Documentation:
X-Priority header value | PidTagImportance property value
--------------------------------------------------------------
Low | 0x00000000
Normal | 0x00000001
High | 0x00000002
X-Priority header value | PidTagImportance property value
--------------------------------------------------------------
5 | 0x00000000
4 | 0x00000000
3 | 0x00000001
2 | 0x00000002
1 | 0x00000002
So X-Priority: 1 = 0x00000002 and 0x00000002 = High Priority.
If you wanted to change this behaviour the code is open source so you are welcome to edit the code to match your needs.
Cheers.
