ErrorsHelo command rejected: need fully-qualified hostnameHost name xxx.com doesn't match IP address xxx.xxx.xxx.xxxSee http://en.wikipedia.org/wiki/List_of_DNS_record_types
By default SMTP Express uses the FQDN assigned to the computer itself. However, you can make a change in the registry to have a different FQDN added to the email headers. To change the registry, do the following:
1. Launch Regedit by choose Run on the Windows start menu then entering "Regedit".
2. Expand the following item:
HKEY_LOCAL_MACHINE\SOFTWARE\Quiksoft\EasyMail SMTP Express
3. Right click and select New String Value.
4. Enter a name of HostName.
5. Now double-click on HostName and under Value Data enter the FQDN you wish to use. For example:
myserver.somedomain.com
dig -x IP
nslookup IP
...
;; ANSWER SECTION:
51.113.12.209.in-addr.arpa. 7200 IN PTR mail.dynatronsoftware.com.
...
dig dynatronsoftware.com MX
...
;; ANSWER SECTION:
dynatronsoftware.com. 7200 IN MX 0 po.dynatronsoftware.com.
...
dig -t TXT dynatronsoftware.com
nmap -vnPN domain.com -p 25
telnet mail.domain.com 25
telnet IP
Helo domain.com
...
Connected to mail.domain.com
220 mail.domain.com Microsoft ESMPT..
...
nslookup computername
nslookup domain.com
nslookup IP
or
nslookup -type=ptr IP
Example:
nslookup -type=ptr IP
51.113.12.209.in-addr.arpa name = mail.dynatronsoftware.com
113.12.209.in-addr.arpa nameserver = ns1.twtelecom.net
113.12.209.in-addr.arpa nameserver = dns3.xspedius.net
113.12.209.in-addr.arpa nameserver = dns4.xspedius.net
113.12.209.in-addr.arpa nameserver = dns2.xspedius.net
113.12.209.in-addr.arpa nameserver = dns1.xspedius.net
113.12.209.in-addr.arpa nameserver = ns2.twtelecom.net
ns1.twtelecom.net internet address = 216.136.95.2
ns2.twtelecom.net internet address = 64.132.94.250
dns1.xspedius.net internet address = 207.191.50.10
dns2.xspedius.net internet address = 207.191.1.10
dns3.xspedius.net internet address = 206.222.97.50
dns4.xspedius.net internet address = 206.222.97.82
So the PTR record (or the reverse DNS) for this IP is mail.dynatronsoftware.com
telnet po.dynatronsoftware.com 25
Helo dynatronsoftware.com
250 dynatronsoftware.com Hello [216.xxx].
250 po.dynatronsoftware.com Hello [216.xxx].