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-rw-r--r--src/src/transports/smtp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/src/transports/smtp.c b/src/src/transports/smtp.c
index 6795a0b2c..8492a7f25 100644
--- a/src/src/transports/smtp.c
+++ b/src/src/transports/smtp.c
@@ -241,7 +241,7 @@ smtp_transport_options_block smtp_transport_option_defaults = {
.tls_verify_cert_hostnames = US"*",
#endif
#ifdef SUPPORT_I18N
- .utf8_downconvert = NULL,
+ .utf8_downconvert = US"-1",
#endif
#ifndef DISABLE_DKIM
.dkim =