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.TH dns_mx 3
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.SH NAME
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dns_mx \- look up Mail eXchanger
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.SH SYNTAX
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.B #include <dns.h>
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int \fBdns_mx\fP(stralloc* \fIout\fR,stralloc* \fIfqdn\fR);
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.SH DESCRIPTION
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dns_mx looks up MX records for the fully-qualified domain name in
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\fIfqdn\fR. It puts the MX records into \fIout\fR and returns 0. Each MX
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record is a two-byte MX distance (big endian) followed by a
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\\0-terminated dot-encoded domain name. If the domain does not exist in
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DNS, or has no MX records, \fIout\fR will be empty.
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If dns_mx has trouble with the DNS lookup or runs out of memory, it returns
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-1, setting errno appropriately. It may or may not change \fIout\fR.
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.SH "SEE ALSO"
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dns_mx_packet(3), dns_ip4(3), dns_ip6(3)
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