diff options
Diffstat (limited to 'src/net/lookup.go')
| -rw-r--r-- | src/net/lookup.go | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/net/lookup.go b/src/net/lookup.go index 0660268249b..01c81dbaaf5 100644 --- a/src/net/lookup.go +++ b/src/net/lookup.go @@ -488,7 +488,9 @@ func (r *Resolver) LookupMX(ctx context.Context, name string) ([]*MX, error) { if mx == nil { continue } - if !isDomainName(mx.Host) { + // Bypass the hostname validity check for targets which contain only a dot, + // as this is used to represent a 'Null' MX record. + if mx.Host != "." && !isDomainName(mx.Host) { return nil, &DNSError{Err: "MX target is invalid", Name: name} } } |