Is this DNS setup correct?

[Everyday]

DNS for my zimbra server:

zimbra.razorservers.com. A IN 12791 63.209.189.23
razorservers.com. NS IN 12778 ns1.razorservers.com.
razorservers.com. NS IN 12778 ns2.razorservers.com.
ns1.razorservers.com. A IN 351 63.209.189.22
ns2.razorservers.com. A IN 62722 63.209.189.30

DNS for my test domain:

westchester-pa.com. MX IN 14400 zimbra.razorservers.com. [Preference = 10]
westchester-pa.com. NS IN 14400 ns2.razorservers.com.
westchester-pa.com. NS IN 14400 ns1.razorservers.com.
westchester-pa.com. TXT IN 14400 "v=spf1 a mx ip4:63.209.189.19 ?all
westchester-pa.com. A IN 14400 63.209.189.19
westchester-pa.com. SOA IN 14400
Primary DNS server: ns1.razorservers.com.
Responsible Name: root@westchester-pa.com.
Serial: 2006112816
Refresh: 7200 (2h)
Retry: 3600 (1h)
Expire: 1209600 (2w)
Minimum/NegTTL: 86400 (1d)
ns1.razorservers.com. A IN 14400 63.209.189.26
ns2.razorservers.com. A IN 14400 63.209.189.19
zimbra.razorservers.com. A IN 12743 63.209.189.23

In my email client I am using:

incoming mail server: westchester-pa.com
outgoing mail server: westchester-pa.com

I can receive mail to my client but not to zimbra. Anything I send from my email client never gets received. Anything I send or try to receive through never comes or goes. I must be missing something.

We run our own external dns through two servers in the data center.

[Everyday]

Update to this. I sent an email from the web interface and it was received,but it took about 4 hours to get delivered. I know that the address I'm sending to is working well because I've been using it all day.

I responded to the email but have not received a reply either through my email client or the web interface.