diff --git a/data/conf/dovecot/dovecot.conf b/data/conf/dovecot/dovecot.conf
index 2df625e2..02ce5dff 100644
--- a/data/conf/dovecot/dovecot.conf
+++ b/data/conf/dovecot/dovecot.conf
@@ -318,4 +318,5 @@ service stats {
     user = vmail
   }
 }
+imap_max_line_length = 2 M
 !include_try /usr/local/etc/dovecot/extra.conf