diff --git a/gnu/packages/mail.scm b/gnu/packages/mail.scm
index 8668cda2118..de55d4f3323 100644
--- a/gnu/packages/mail.scm
+++ b/gnu/packages/mail.scm
@@ -4265,7 +4265,7 @@ It is a replacement for the @command{urlview} program.")
 (define-public mumi
   (package
     (name "mumi")
-    (version "0.8.0")
+    (version "0.9.0")
     (source (origin
               (method git-fetch)
               (uri (git-reference
@@ -4274,7 +4274,7 @@ It is a replacement for the @command{urlview} program.")
               (file-name (git-file-name name version))
               (sha256
                (base32
-                "0x605gj6z441xw4fl7x23z3wmbg43cib4q0v8f29f7x88qx8yndm"))))
+                "0hg0f92388fli1l341ilgqqpga6bigg6fsfimlkf7f8qxngp2l7d"))))
     (build-system gnu-build-system)
     (arguments
      (list
diff --git a/gnu/services/web.scm b/gnu/services/web.scm
index 79e52212160..2b01095f751 100644
--- a/gnu/services/web.scm
+++ b/gnu/services/web.scm
@@ -2059,14 +2059,15 @@ WSGIPassAuthorization On
 
 (define mumi-config-file
   (match-record-lambda <mumi-configuration>
-      (file-tags)
+      (mailer? file-tags)
     (computed-file "mumi.conf"
                    #~(begin
                        (use-modules (srfi srfi-26))
 
                        (call-with-output-file #$output
                          (cut write
-                              '((file-tags . #$file-tags))
+                              '((mailer-enabled? . #$mailer?)
+                                (file-tags . #$file-tags))
                               <>))))))
 
 (define (mumi-shepherd-services config)
@@ -2085,8 +2086,7 @@ WSGIPassAuthorization On
             (start #~(make-forkexec-constructor
                       `(#$(file-append mumi "/bin/mumi") "web"
                         ,(string-append "--config="
-                                        #$(mumi-config-file config))
-                        ,@(if #$mailer? '() '("--disable-mailer")))
+                                        #$(mumi-config-file config)))
                       #:environment-variables #$environment
                       #:user "mumi" #:group "mumi"
                       #:log-file #$%mumi-log))