Look at the log debug output when it's NOT working. According to what you're showing email was sent. It's impossible to troubleshoot based on a successful attempt.
On a side note you may find it easier to just use "/log print" and copy/paste the relevant parts than to resize log windows and take screenshots. It's text, and this is a text forum. They're kind of made for one another.
Specific answers require specific questions. When in doubt, post the output of "/ip address print detail", "/ip route print detail", "/interface print detail", "/ip firewall export", and an accurate network diagram.