Here are the steps which I was need to overview, and change again.
- double check with ISP vendor regarding their router ports. All good. (for info: my ISP router have by default open all ports if static ip available .Not sure how works at others ISP from global perspective)
- from Matthew Leyda instruction, True, somthing was wrong with MX record and DNS provider has fixed it.
The sending still not working, but was check and change next things:
- I had disable IPv6 from Domain >> Edit >> Technical tab
- from software server settings >> protocol settings >> smtp out change from static ip address to Use The Domain IP option,
and disable IPv6
finally restart services from SmarterMail left menu Manage >> Service >> check all >> Stop and
and create new message. Previous failure message will be not used again as I guess are stil. holding parameters from previous mail server settings.