diff --git a/compose.yaml b/compose.yaml
index b8d51c9..1dbdd93 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -27,6 +27,11 @@ services:
       - PERMIT_DOCKER=none
       - ONE_DIR=1
       - SPOOF_PROTECTION=1
+      # Historical-archive mailboxes hold legacy .eml up to ~57 MB (gator #101
+      # defacto import) — raise the 10M Dovecot/Postfix message cap to 200M
+      # (POSTFIX_MESSAGE_SIZE_LIMIT sets both quota_max_mail_size and postfix
+      # message_size_limit in DMS).
+      - POSTFIX_MESSAGE_SIZE_LIMIT=200000000
     cap_add:
       - NET_ADMIN
       - SYS_PTRACE