diff --git a/asciinema/compose.yaml b/asciinema/compose.yaml
index 22490a9..808e071 100644
--- a/asciinema/compose.yaml
+++ b/asciinema/compose.yaml
@@ -21,6 +21,9 @@ services:
       SMTP_TLS: never
       SMTP_SSL: true
       SMTP_AUTH: always
+      SMTP_NO_MX_LOOKUPS: true
+      SMTP_TLS_VERIFY_HOST: false
+      SMTP_TLS_VERIFY_CERT: false
       MAIL_FROM_ADDRESS: ${EMAIL_FROM}
       MAIL_REPLY_TO_ADDRESS: ${ASCIINEMA_MAIL_REPLY_TO}
       SIGN_UP_DISABLED: ${ASCIINEMA_SIGN_UP_DISABLED:-false}