TESTMXLOOKUP(1)
NAME
testmxlookup - Look up mail relays for a domain
SYNOPSIS
testmxlookup [domain...]
DESCRIPTION
testmxlookup lists the names and IP addresses of mail relays that
receive mail for the domain. This is useful in diagnosing mail delivery
problems.
- testmxlookup sends a DNS MX query for the specified domain, followed by
A/AAAA queries, if needed. testmxlookup lists the hostname and the IP
address of every mail relay, and its MX priority.
- DIAGNOSTICS
- The error message "Hard error" indicates that the domain does not
exist, or does not have any mail relays. The error message "Soft error" indicates a temporary error condition (usually a network failure of
some sorts, or the local DNS server is down).
SEE ALSO
courier(8)[1], RFC 1035[2].
NOTES
- 1. courier(8)
- [set $man.base.url.for.relative.links]/courier.html
- 2. RFC 1035
http://www.rfc-editor.org/rfc/rfc1035.txt