I use postman smtp plugin for email service. Recently I found that our site can't send mail. I did a connectivity test and it said No outbound route between this site and the Internet on Port 587, 465,25 while status be tagged as close. I had moved all site to other server which is under control by myself and did the same test then found that all problems were gone.
Hi @frankh314, thanks for posting.
When using Managed WordPress, the PHP Mail() function is preconfigured to send email.
If you wish to use a separate plugin to send emails, you will want to send emails through the SMTP relay server, relay-hosting.secureserver.net. You cannot send through an external SMTP server.