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-rw-r--r--Bugzilla/Mailer.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/Bugzilla/Mailer.pm b/Bugzilla/Mailer.pm
index 389b6f69e..bcf17458f 100644
--- a/Bugzilla/Mailer.pm
+++ b/Bugzilla/Mailer.pm
@@ -154,7 +154,7 @@ sub MessageToMTA {
# address, but other mailers won't.
my $urlbase = Bugzilla->params->{'urlbase'};
$urlbase =~ m|//([^:/]+)[:/]?|;
- $hostname = $1;
+ $hostname = $1 || 'localhost';
$from .= "\@$hostname" if $from !~ /@/;
$email->header_set('From', $from);