vCenter Appliance not sending emails

[reesewon]

Hello,

I have recently deployed a vCenter 5.0 appliance.  I set up a test alert for suspending a VM, and uppon testing, I was not getting any email alerts.  I checked the connectivity to the mail server as well as sending from the mail server (internal) to my email and that worked fine.  I then SSH'd into the vCenter server and checked the mail queue.  I saw there was a DNS resolution issue.  Also, I could not resolve anything with ping either.  I checked my network settings and, duh, I didn't set up DNS settings (left IPv6 as DHCP, not SLAAC).  So, I changed that and then resolution via ping was working properly.  I then cleared the mail queue and reactivated the alarm.  I checked the mail queue and it gave a Deferred: 450 4.1.8 which means domain of recipient does not resolve.  What could be causing this issue?

[AWo]

Just a quick guess, I don't know if that applies:

Do you have a mx record for your mail domain?

AWo

[reesewon]

Yes I do.  I also tested with a gmail account to rule out any DNS issues for our domain.

[AWo]

You're talking about mails send from within the (which) appliance?

AWo

[reesewon]

The vCenter Server appliance.

[AWo]

You have configured the mail settings in the vCenter settings?

If yes, go to the vCenter server and try to open a connection to the designated mail host:

telnet <FQDN of mail host> 25

Do you get a reply?

AWo

[reesewon]

I have configured the email settings in vCenter.

Unfortunately with the appliance, it seems as though there is no telnet client installed.

EDIT:

I added a Suse repo and installed a telnet client and I do get the appropriate 220 response when you telnet to the email server on port 25.

[AWo]

For now...

AWo

[AWo]

Does the email host accept SMTP mails from the sending domain (what's behind the @). If it is not configured as an open relay the sending domain must be listed there.

AWo

[reesewon]

It seems like it is being blocked because the dnsdomainname is mydomain.local.  Any mail server will reject this.  How can I change that to mydomain.com.