diff --git a/src/matrix.rs b/src/matrix.rs
index eaca4aa..33e709f 100644
--- a/src/matrix.rs
+++ b/src/matrix.rs
@@ -128,7 +128,8 @@ pub async fn send(from_mail: &Option<Mailbox>, recipient: &Mailbox, plain_conten
                             // Continuously check whether the room has been joined.
                             // Joins can be significantly delayed, depending on the room and the server
                             let mut joined = false;
-                            while !joined {
+                            let mut counter = 0;
+                            while !joined && counter < 10{
                                 match c.get_room(&roomid) {
                                     Some(Room::Joined(_)) => joined = true,
                                     _ => (),
@@ -137,12 +138,14 @@ pub async fn send(from_mail: &Option<Mailbox>, recipient: &Mailbox, plain_conten
                                     Ok(_) => (),
                                     Err(_e) => (),
                                 };
-                                std::thread::sleep(std::time::Duration::from_millis(250));
+                                std::thread::sleep(std::time::Duration::from_millis(u64::pow(2, counter) * 100));
+                                counter += 1;
                             }
                             if let Some(Room::Joined(joined)) = c.get_room(&roomid) {
                                 joined
                             }
                             else {
+                                println!("Joining room timed out.");
                                 continue;
                             }
                         },