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There's no such feature.  But it's easy to write.  Apply this patch:

```diff
From 8ea7d1cf4933ca24006308ac61aa50fb8ab33b02 Mon Sep 17 00:00:00 2001
From: Alejandro Colomar <alx@kernel.org>
Date: Sat, 30 Sep 2023 17:44:03 +0200
Subject: [PATCH] query: outformat: Add "mailto" format

Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 filter.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/filter.c b/filter.c
index d5b18dd..a441615 100644
--- a/filter.c
+++ b/filter.c
@@ -80,6 +80,7 @@ static int    custom_export_database(FILE *out, struct db_enumerator e);
 
 void vcard_export_item(FILE *out, int item);
 void muttq_print_item(FILE *file, int item);
+void mailto_print_item(FILE *file, int item);
 void custom_print_item(FILE *out, int item);
 
 /*
@@ -121,6 +122,7 @@ struct abook_output_filter e_filters[] = {
 struct abook_output_item_filter u_filters[] = {
        { "vcard", N_("vCard 2 file"), vcard_export_item },
        { "muttq", N_("mutt alias"), muttq_print_item },
+       { "mailto", N_("mailto address"), mailto_print_item },
        { "custom", N_("Custom format"), custom_print_item },
        { "\0", NULL }
 };
@@ -2300,6 +2302,22 @@ mutt_query_export_database(FILE *out, struct db_enumerator e)
  * end of mutt alias export filter
  */
 
+void mailto_print_item(FILE *file, int item)
+{
+       abook_list *emails, *e;
+       char *tmp = db_email_get(item);
+
+       emails = csv_to_abook_list(tmp);
+       free(tmp);
+
+       for(e = emails; e; e = e->next) {
+               fprintf(file, "%s <%s>\n", db_name_get(item), e->data);
+               if(!opt_get_bool(BOOL_MUTT_RETURN_ALL_EMAILS))
+                       break;
+       }
+       abook_list_free(&emails);
+}
+
 
 /*
  * printable export filter
-- 
2.40.1

```

Then, build abook:

```sh
./configure && make
```

And now you can do this:

```sh
$ ./abook --mutt-query alx --outformat mailto
Alejandro Colomar Andres <alx@kernel.org>
Alejandro Colomar Andres <alx.manpages@gmail.com>
Alejandro Colomar Andres <alx.mailinglists@gmail.com>
Alejandro Colomar Andres <alejandro.colomar@gmail.com>
Alejandro Colomar Andres <1903716@gmail.com>
Alejandro Colomar Andres <colomar.6.4.3@gmail.com>
```

(I'll send this patch to the project soon, so hopefully this feature will be available soon.)