diff --git a/.env.dist b/.env.dist
index 81ae68dd..0b19e360 100644
--- a/.env.dist
+++ b/.env.dist
@@ -108,7 +108,7 @@ POSTFIX_MAILBOX_SIZE_LIMIT=
 
 # Set the message size limit for all users. If set to zero, the size will be unlimited (not recommended!)
 #
-# empty => 1048576 (10 MB)
+# empty => 10240000 (~10 MB)
 POSTFIX_MESSAGE_SIZE_LIMIT=
 
 # Enables a report being sent (created by pflogsumm) on a regular basis.
diff --git a/README.md b/README.md
index 729c35ec..51da6915 100644
--- a/README.md
+++ b/README.md
@@ -314,7 +314,7 @@ Set the mailbox size limit for all users. If set to zero, the size will be unlim
 
 Set the message size limit for all users. If set to zero, the size will be unlimited (not recommended!)
 
-- **empty** => 1048576 (10 MB)
+- **empty** => 10240000 (~10 MB)
 
 ##### ENABLE_MANAGESIEVE
 
diff --git a/target/start-mailserver.sh b/target/start-mailserver.sh
index 2a610d68..41b132c2 100644
--- a/target/start-mailserver.sh
+++ b/target/start-mailserver.sh
@@ -19,7 +19,7 @@ DEFAULT_VARS["ENABLE_POSTGREY"]="${ENABLE_POSTGREY:="0"}"
 DEFAULT_VARS["POSTGREY_DELAY"]="${POSTGREY_DELAY:="300"}"
 DEFAULT_VARS["POSTGREY_MAX_AGE"]="${POSTGREY_MAX_AGE:="35"}"
 DEFAULT_VARS["POSTGREY_TEXT"]="${POSTGREY_TEXT:="Delayed by postgrey"}"
-DEFAULT_VARS["POSTFIX_MESSAGE_SIZE_LIMIT"]="${POSTFIX_MESSAGE_SIZE_LIMIT:="1048576"}"  # 10 MB by default
+DEFAULT_VARS["POSTFIX_MESSAGE_SIZE_LIMIT"]="${POSTFIX_MESSAGE_SIZE_LIMIT:="10240000"}"  # ~10 MB by default
 DEFAULT_VARS["POSTFIX_MAILBOX_SIZE_LIMIT"]="${POSTFIX_MAILBOX_SIZE_LIMIT:="0"}"        # no limit by default
 DEFAULT_VARS["ENABLE_SASLAUTHD"]="${ENABLE_SASLAUTHD:="0"}"
 DEFAULT_VARS["SMTP_ONLY"]="${SMTP_ONLY:="0"}"