I am having a terrible nightmare with SMTP service on Ubuntu 14.04 and Sentora.
I have created a brand new Droplet and installed Sentora. Everything works great except the SMTP service on the Mail app on my mac os.
It resolves the incoming mail server, but returns an error on the SMTP service on port 25.
I have searched everywhere for an answer but no go.
I can telnet my server on port 25 and connects as ESMTP, but I cannot connect using the Mail app on my mac.
Again, webmail works great. And my android phone also works great.