iptables NAT entry times out but connects from firewall

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There is a firewall with two NICs and the below rule to allow an
internal host to connect out to smtp servers on the internet. Some
hosts have a connection timeout on a connect from $INTERNAL_IP_OF_SMTP
yet connect from the firewall just fine.

iptables -t nat -A POSTROUTING -p tcp -o $NIC_EXTERNAL \
        --dport 25 -s $INTERNAL_IP_OF_SMTP -j MASQUERADE

ex:
on firewall:
        telnet csoc-mail-msfc.csoconline.com 25
        
        above connects ok

on $INTERNAL_IP_OF_SMTP
        telnet csoc-mail-msfc.csoconline.com 25

        connection times out

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