I would like to use smtp.zoho.com as a smart host for some of my servers to send mail.
I've set it up using postfix with stunnel so that it can talk via SSL. Postfix does not support SSL directly, as SSL is deprecated for mail. TLS is the standard now, but zoho does not support it.
My stunnel config file looks like this:
[smtp-tls-wrapper]
accept = 11125
client = yes
connect = smtp.zoho.com:465
When I telnet using the tunnel, I get:
# telnet 127.0.0.1 11125
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
220 mx.zohomail.com SMTP Server ready May 29, 2013 7:29:00 AM PDT
I should not get mx.zohomail.com when I telnet; mx.zohomail.com is not the same server as smtp.zoho.com.
Somehow behind the scenes, when I use stunnel to open port 465 on smtp.zoho.com I'm rerouted to mx.zohomail.com.
If I telnet directly, I do get to smtp.zoho.com:
$ telnet smtp.zoho.com 465
Trying 74.201.154.90...
Connected to smtp.zoho.com.
Escape character is '^]'.
If I run stunnel is debug mode, I see that it is going to smtp.zoho.com
2013.05.29 15:02:57 LOG5[23779:139905920849664]: Service [smtp-tls-wrapper] accepted connection from 127.0.0.1:59687
2013.05.29 15:02:57 LOG5[23779:139905920849664]: connect_blocking: connected 74.201.154.90:465
So, something on zoho's side must be redirecting my stunnel to mx.zohomail.com
I've sent several messages to support at zohomail dot com, but have not received a reply.
Thanks for any help ....
Eileen