diff --git a/src/job.rs b/src/job.rs
index 49a109169..edc026ce3 100644
--- a/src/job.rs
+++ b/src/job.rs
@@ -200,7 +200,7 @@ impl Job {
                         info!(context, "smtp-sending out mime message:");
                         println!("{}", String::from_utf8_lossy(&body));
                     }
-                    match smtp.send(context, recipients_list, body, self.job_id) {
+                    match task::block_on(smtp.send(context, recipients_list, body, self.job_id)) {
                         Err(crate::smtp::send::Error::SendError(err)) => {
                             // Remote error, retry later.
                             smtp.disconnect();
diff --git a/src/smtp/send.rs b/src/smtp/send.rs
index fcfbf2d68..29975cce8 100644
--- a/src/smtp/send.rs
+++ b/src/smtp/send.rs
@@ -3,8 +3,6 @@
 use super::Smtp;
 use async_smtp::*;
 
-use async_std::task;
-
 use crate::context::Context;
 use crate::events::Event;
 
@@ -23,7 +21,7 @@ pub enum Error {
 impl Smtp {
     /// Send a prepared mail to recipients.
     /// On successful send out Ok() is returned.
-    pub fn send(
+    pub async fn send(
         &mut self,
         context: &Context,
         recipients: Vec<EmailAddress>,
@@ -47,7 +45,7 @@ impl Smtp {
                 message,
             );
 
-            task::block_on(transport.send(mail)).map_err(Error::SendError)?;
+            transport.send(mail).await.map_err(Error::SendError)?;
 
             context.call_cb(Event::SmtpMessageSent(format!(
                 "Message len={} was smtp-sent to {}",