Since I have upgraded to High Sierra, the SMTP does not work. I have uninstalled and re-installed the OS multiple time... The usual symptom is that the port gets configured as 0 instead of 567. Any update or fix to that close to 10 years old problem affecting Mail ???????
MacBook Pro with Retina display, macOS High Sierra (10.13.3)
In Mac OS high Sierra 10.13.3 using as a gmail account you don't have to enter the port settings other settings like host name , gmail address or password manually .
Now they are saved as automatically , in previous versions the Mac user has to enter it manually .
And its a very useful setting and it has no impact of sending or receiving mails , you have to just configure the apple mail application with web mail account and rest of settings will come ok by default .
See these screen shots .
The outgoing of SMTP port is 587, or you can try 465. You are using 567. That may be why it isn't working. Your incoming mail port should be 143, or it can be 993.
High Sierra - SMTP not working
