Check your DNS Settings

A DNS server takes care of translating domain names to ip addresses. In order to receive mail using Jsmtpd, you need to setup your DNS Server. It can be provided by your company, or hosting service where you bought your domain name, or whatever. Special DNS entries are used to indicate the mail servers, called mail exchangers (MX records). A DNS service can provide mutltiple MX records, ordered by priority to setup multiple mail server (smpt).

Nslookup

Under win32 or unixes platforms, your system provides a command line tool nslookup. This tool can manually query a DNS server to check domain to ip addresses. To check your settings, first start the nslookup utility

   nslookup

and press return. A ">" character indicates you'r in the nslookup shell. Tell it we're interested in mx records, by typing :

   >set q=MX

Then, ask for your domain name. It this example, we're querying the domain jsmtpd.org :

   >jsmtpd.org

The response looks like :

Non-authoritative answer:
jsmtpd.org      mail exchanger = 1 taldius.jsmtpd.org.
jsmtpd.org      mail exchanger = 5 smtp-back.jsmtpd.org.

Authoritative answers can be found from:
jsmtpd.org      nameserver = ns.ovh.net.
jsmtpd.org      nameserver = dns.ovh.net.
taldius.jsmtpd.org      internet address = 62.212.97.80
smtp-back.jsmtpd.org    internet address = 62.212.97.80
ns.ovh.net      internet address = 212.27.32.132
dns.ovh.net     internet address = 213.186.33.102

You can see that the domain has two mail exchangers : taldius.jsmtpd.org (main, priority=1) and smtp-back.jsmtpd.org (secondary, priority=5). Aditionnaly, the nslookup utility converted theses two names to ip addresses : taldius.jsmtpd.org internet address = 62.212.97.80.

To receive mail, your domain should have at least one mail exchanger set, and the dns server must be able to convert the mail exchanger's name to an ip address.

Links

A commonly used DNS server, bind