diff --git a/meli.1 b/meli.1
index 2a9b98128..ce0b21c26 100644
--- a/meli.1
+++ b/meli.1
@@ -339,6 +339,10 @@ composing mail commands:
 in composer, add
 .Ar PATH
 as an attachment
+.It Cm add-attachment < Ar CMD Ar ARGS
+in composer, pipe
+.Ar CMD Ar ARGS
+output into an attachment
 .It Cm remove-attachment Ar INDEX
 remove attachment with given index
 .It Cm toggle sign
diff --git a/meli.conf.5 b/meli.conf.5
index e43bf9437..f1cc7bd68 100644
--- a/meli.conf.5
+++ b/meli.conf.5
@@ -281,6 +281,8 @@ If it's missing, the environment variable $EDITOR is looked up.
 (optional) set format=flowed [RFC3676] in text/plain attachments.
 .\" default value
 .Pq Em true
+.It Ic default_header_values Ar hash table String[String]
+Default header values used when creating a new draft.
 .El
 .Sh SHORTCUTS
 Shortcuts can take the following values:
diff --git a/src/components/mail/compose.rs b/src/components/mail/compose.rs
index 0fd3cbac6..7ad5a1832 100644
--- a/src/components/mail/compose.rs
+++ b/src/components/mail/compose.rs
@@ -147,6 +147,23 @@ impl Composer {
             id: ComponentId::new_v4(),
             ..Default::default()
         };
+        for (h, v) in context.settings.composing.default_header_values.iter() {
+            if v.is_empty() {
+                continue;
+            }
+            if let Some(k) = ret
+                .draft
+                .headers()
+                .keys()
+                .find(|k| k.eq_ignore_ascii_case(h))
+            {
+                let _k = k.clone();
+                ret.draft.headers_mut().insert(_k, v.into());
+            } else {
+                /* set_header() also updates draft's header_order field */
+                ret.draft.set_header(h, v.into());
+            }
+        }
         ret.pager
             .set_colors(crate::conf::value(context, "theme_default"));
         ret
diff --git a/src/conf/composing.rs b/src/conf/composing.rs
index a497eaac0..89bf8c71a 100644
--- a/src/conf/composing.rs
+++ b/src/conf/composing.rs
@@ -21,6 +21,7 @@
 
 //! Configuration for composing email.
 use super::default_vals::{false_val, none, true_val};
+use std::collections::HashMap;
 
 /// Settings for writing and sending new e-mail
 #[derive(Debug, Serialize, Deserialize, Clone)]
@@ -38,6 +39,10 @@ pub struct ComposingSettings {
     /// Default: true
     #[serde(default = "true_val")]
     pub format_flowed: bool,
+    /// Set default header values for new drafts
+    /// Default: empty
+    #[serde(default)]
+    pub default_header_values: HashMap<String, String>,
 }
 
 impl Default for ComposingSettings {
@@ -47,6 +52,7 @@ impl Default for ComposingSettings {
             editor_cmd: None,
             embed: false,
             format_flowed: true,
+            default_header_values: HashMap::default(),
         }
     }
 }
diff --git a/src/execute.rs b/src/execute.rs
index 6678b6929..80cda54b0 100644
--- a/src/execute.rs
+++ b/src/execute.rs
@@ -216,10 +216,16 @@ define_commands!([
                   desc: "add-attachment PATH",
                   parser:(
                       named!( add_attachment<Action>,
-                              do_parse!(
+                              alt_complete!(
+                                   do_parse!(
+                                  ws!(tag!("add-attachment"))
+                                  >> ws!(tag!("<"))
+                                  >> cmd: quoted_argument
+                                  >> (Compose(AddAttachmentPipe(cmd.to_string()))))
+                                  | do_parse!(
                                   ws!(tag!("add-attachment"))
                                   >> path: quoted_argument
-                                  >> (Compose(AddAttachment(path.to_string())))
+                                  >> (Compose(AddAttachment(path.to_string()))))
                               )
                       );
                   )
diff --git a/src/execute/actions.rs b/src/execute/actions.rs
index cdb339c47..d9bc9a567 100644
--- a/src/execute/actions.rs
+++ b/src/execute/actions.rs
@@ -77,6 +77,7 @@ pub enum ViewAction {
 #[derive(Debug)]
 pub enum ComposeAction {
     AddAttachment(String),
+    AddAttachmentPipe(String),
     RemoveAttachment(usize),
     ToggleSign,
 }
diff --git a/src/types/helpers.rs b/src/types/helpers.rs
index ac089e280..393ef0e6f 100644
--- a/src/types/helpers.rs
+++ b/src/types/helpers.rs
@@ -43,7 +43,7 @@ impl Drop for File {
 }
 
 impl File {
-    pub fn file(&mut self) -> std::fs::File {
+    pub fn file(&self) -> std::fs::File {
         OpenOptions::new()
             .read(true)
             .write(true)