SMTP Auth Issues/ soooo Confused.

[Johnny19]

I have atempted to enable SMTP Auth simply by checking the box, and I confirmed this by running the command.

[zimbra@host ~]$ zmprov getServer host.mydomain.com | grep Auth
zimbraMtaAuthEnabled: TRUE
zimbraMtaAuthHost: host.mydomain.com
zimbraMtaAuthURL: MyDomain | Domain Names, Web Hosting, and Free Domain Services /service/soap/
zimbraMtaTlsAuthOnly: FALSE
[zimbra@host ~]$

I can easily access mail to my server via port 25 which I though would change to port 587. when attempting to sent mail via port 587 it gives me an error.

[root@host ~]# telnet host.mydomain.com 587
telnet: connect to address xxx.xxx.xxx.13: Connection refused
telnet: Unable to connect to remote host: Connection refused
[root@host ~]#

and successfull if I used port 25

[root@host ~]# telnet host.mydomain.com 25
Trying xxx.xxx.xxx.13...
Connected to host.mydomain.com (xxx.xxx.xxx.13).
Escape character is '^]'.
220 **********************************
HELO

is there some other setting I need to configure, I don't understand how this is supposed to work. There is no firewall running on the server. I have Itables turned off. and there is no services i can see running on port 587 when i netstat -a and grep for the port.
any help would be appreciated.

[ewilen]

I don't have any experience with ZCS 4.5 or earlier, so YMMV.

That said I believe that ZCS 5 and earlier do not use port 587. Instead they use port 465 for authenticated/secure SMTP. You should be able to verify which ports are open using nmap or a similar tool. There is a way to enable port 587; search the forums and wiki for info.

Even with secure/authenticated connections enabled, SMTP will still exist on port 25 because that's always allowed/needed for mail that meets these criteria:

1. Not delivered from a trusted network.
2. Final destination is a local domain.

In other words: mail coming from external mail servers, as long as no attempt is made to relay to external addresses.

[Johnny19]

Thanks for the reply, I will look into this.