Hi,
The same NEU working for PO type NB and it should work for Other PO type also.
OK. Just check you have Communication strategy CS01 for NEU in t.code NACE for application EF.
Now cross check vendor in your New PO type(ME23N) and for vendor in t.code XK03- you must have StandardComm.Mtd field as INT E-mail with Vendor E-mail ID in E-Mail field...If not maintained- go and maintain it in t.code XK02 and save.
Now create new PO with new PO type and see the difference!
Regards,
Biju K