diff --git a/.env.production.sample b/.env.production.sample
index a7f9eb4bf..9bb988ea6 100644
--- a/.env.production.sample
+++ b/.env.production.sample
@@ -26,7 +26,7 @@ OTP_SECRET=
 # EMAIL_DOMAIN_WHITELIST=example1.com|example2.de|etc
 
 # E-mail configuration
-SMTP_SERVER=smtp.mailgun.org
+SMTP_SERVER=smtp.mailgun.org, smtp.sparkpostmail.com, etc.
 SMTP_PORT=587
 SMTP_LOGIN=
 SMTP_PASSWORD=