diff --git a/src/constants.rs b/src/constants.rs
index 7d377289d..01b847fb8 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -223,6 +223,9 @@ pub(crate) const DC_FOLDERS_CONFIGURED_VERSION: i32 = 5;
 // `max_smtp_rcpt_to` in the provider db.
 pub(crate) const DEFAULT_MAX_SMTP_RCPT_TO: usize = 50;
 
+/// Same as `DEFAULT_MAX_SMTP_RCPT_TO`, but for chatmail relays.
+pub(crate) const DEFAULT_CHATMAIL_MAX_SMTP_RCPT_TO: usize = 999;
+
 /// How far the last quota check needs to be in the past to be checked by the background function (in seconds).
 pub(crate) const DC_BACKGROUND_FETCH_QUOTA_CHECK_RATELIMIT: u64 = 12 * 60 * 60; // 12 hours
 
diff --git a/src/context.rs b/src/context.rs
index 12eae9707..9287777c9 100644
--- a/src/context.rs
+++ b/src/context.rs
@@ -545,7 +545,7 @@ impl Context {
             .and_then(|provider| provider.opt.max_smtp_rcpt_to)
             .map_or_else(
                 || match is_chatmail {
-                    true => usize::MAX,
+                    true => constants::DEFAULT_CHATMAIL_MAX_SMTP_RCPT_TO,
                     false => constants::DEFAULT_MAX_SMTP_RCPT_TO,
                 },
                 usize::from,