diff --git a/doc/d-utils.md b/doc/d-utils.md
index 6b3641a..fdf2ad2 100644
--- a/doc/d-utils.md
+++ b/doc/d-utils.md
@@ -257,24 +257,6 @@ pair consisting of symbol created by interning the string of
 non-whitespace characters before the first whitespace character and
 the string with the rest of the line.
 
-## util-list [module]
-
-    (import util-list)
-
-This module implements basic list functionality which is common in
-most scheme implementations.
-
-### filter [procedure]
-
-    (filter pred?
-            lst)
-
-* ```pred?``` - procedure accepting any value and returning #t or #f
-* ```lst``` - list to be filtered
-
-Returns a list containing only elements matching given ```pred?```
-predicate.
-
 ## util-proc [module]
 
     (import util-proc)
@@ -428,12 +410,14 @@ sent to the address stored within.
     (send-mail body-lines
                #:from (from #f)
                #:to to
-               #:subject subject)
+               #:subject subject
+               #:headers (headers (quote ())))
 
 * ```body-lines``` - lines of the email
 * ```from``` - email address from string
 * ```to``` - email address to string
 * ```subject``` - email subject string
+* ```headers``` - list of headers to add
 
 Sends email using mail(1) command. The arguments ```#:to``` and
 ```#:subject``` are mandatory. Argument ```#:from``` is optional.
diff --git a/install-eggs.sh b/install-eggs.sh
index 1f2c4f7..85dada4 100644
--- a/install-eggs.sh
+++ b/install-eggs.sh
@@ -54,6 +54,7 @@ trap chicken_cleanup INT QUIT
 
 # Install required eggs
 chicken_install sqlite3
+chicken_install srfi-1
 
 # Normal termination cleanup
 chicken_cleanup
diff --git a/src/Makefile b/src/Makefile
index ee4f928..0615ce5 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -56,28 +56,26 @@ HACKERBASE-OBJS=hackerbase.o testing.o listing.o cal-month.o		\
 	 util-git.o cal-day.o util-stdout.o cal-format.o table.o	\
 	 sgr-list.o sgr-block.o table-processor.o table-border.o	\
 	 table-style.o sgr-state.o util-utf8.o sgr-cell.o		\
-	 template-list-expander.o box-drawing.o util-list.o		\
-	 export-web-static.o util-dir.o dokuwiki.o racket-kwargs.o	\
-	 duck.o util-bst.o util-bst-bdict.o util-bst-ldict.o		\
-	 util-bst-lset.o mailman2.o mailman-common.o mailman3.o		\
-	 mailman3-sql.o
+	 template-list-expander.o box-drawing.o export-web-static.o	\
+	 util-dir.o dokuwiki.o racket-kwargs.o duck.o util-bst.o	\
+	 util-bst-bdict.o util-bst-ldict.o util-bst-lset.o mailman2.o	\
+	 mailman-common.o mailman3.o mailman3-sql.o
 
 GENDOC-SOURCES=gendoc.scm duck-extract.import.scm			\
 	util-time.import.scm util-csv.import.scm util-git.import.scm	\
 	util-io.import.scm util-stdout.import.scm			\
-	util-parser.import.scm util-list.import.scm			\
-	util-proc.import.scm util-format.import.scm			\
-	util-tag.import.scm util-string.import.scm			\
-	util-bst.import.scm util-bst-bdict.import.scm			\
-	util-bst-ldict.import.scm util-dir.import.scm			\
-	util-utf8.import.scm
+	util-parser.import.scm util-proc.import.scm			\
+	util-format.import.scm util-tag.import.scm			\
+	util-string.import.scm util-bst.import.scm			\
+	util-bst-bdict.import.scm util-bst-ldict.import.scm		\
+	util-dir.import.scm util-utf8.import.scm
 
 GENDOC-OBJS=gendoc.o duck-extract.o util-time.o util-csv.o util-io.o	\
 	progress.o testing.o util-proc.o util-git.o util-io.o		\
-	util-stdout.o util-parser.o util-list.o util-proc.o		\
-	util-format.o racket-kwargs.o util-bst-ldict.o util-tag.o	\
-	duck.o util-string.o util-bst.o util-bst-bdict.o		\
-	util-bst-ldict.o util-dir.o util-utf8.o
+	util-stdout.o util-parser.o util-proc.o util-format.o		\
+	racket-kwargs.o util-bst-ldict.o util-tag.o duck.o		\
+	util-string.o util-bst.o util-bst-bdict.o util-bst-ldict.o	\
+	util-dir.o util-utf8.o
 
 .PHONY: imports
 imports: $(HACKERBASE-DEPS)
@@ -141,13 +139,13 @@ LISTING-SOURCES=listing.scm testing.import.scm ansi.import.scm		\
 listing.o: listing.import.scm
 listing.import.scm: $(LISTING-SOURCES)
 
-ANSI-SOURCES=ansi.scm testing.import.scm util-list.import.scm
+ANSI-SOURCES=ansi.scm testing.import.scm
 
 ansi.o: ansi.import.scm
 ansi.import.scm: $(ANSI-SOURCES)
 
 COMMAND-LINE-SOURCES=command-line.scm testing.import.scm	\
-	 util-proc.import.scm util-list.import.scm
+	 util-proc.import.scm
 
 command-line.o: command-line.import.scm
 command-line.import.scm: $(COMMAND-LINE-SOURCES)
@@ -157,13 +155,12 @@ MBASE-SOURCES=mbase.scm testing.import.scm util-bst-ldict.import.scm	\
 	 cal-period.import.scm cal-month.import.scm			\
 	 configuration.import.scm progress.import.scm			\
 	 mbase-dir.import.scm util-tag.import.scm			\
-	 racket-kwargs.import.scm util-bst-bdict.import.scm		\
-	 util-list.import.scm
+	 racket-kwargs.import.scm util-bst-bdict.import.scm
 
 mbase.o: mbase.import.scm
 mbase.import.scm: $(MBASE-SOURCES)
 
-PRIMES-SOURCES=primes.scm testing.import.scm util-list.import.scm
+PRIMES-SOURCES=primes.scm testing.import.scm
 
 primes.o: primes.import.scm
 primes.import.scm: $(PRIMES-SOURCES)
@@ -171,8 +168,7 @@ primes.import.scm: $(PRIMES-SOURCES)
 BRMEMBER-SOURCES=brmember.scm util-bst-ldict.import.scm			\
 	cal-period.import.scm testing.import.scm cal-month.import.scm	\
 	configuration.import.scm primes.import.scm			\
-	bank-account.import.scm util-tag.import.scm			\
-	util-list.import.scm
+	bank-account.import.scm util-tag.import.scm
 
 brmember.o: brmember.import.scm
 brmember.import.scm: $(BRMEMBER-SOURCES)
@@ -197,8 +193,7 @@ BRMEMBER-PARSER-SOURCES=brmember-parser.scm brmember.import.scm	\
 	testing.import.scm util-bst-ldict.import.scm		\
 	cal-month.import.scm cal-period.import.scm		\
 	configuration.import.scm util-string.import.scm		\
-	util-parser.import.scm cal-day.import.scm		\
-	util-list.import.scm
+	util-parser.import.scm cal-day.import.scm
 
 brmember-parser.o: brmember-parser.import.scm
 brmember-parser.import.scm: $(BRMEMBER-PARSER-SOURCES)
@@ -210,23 +205,21 @@ MEMBERS-PRINT-SOURCES=members-print.scm util-bst-ldict.import.scm	\
 	bank-account.import.scm members-fees.import.scm			\
 	members-payments.import.scm brmember-format.import.scm		\
 	specification.import.scm cal-format.import.scm			\
-	util-git.import.scm util-list.import.scm			\
-	racket-kwargs.import.scm
+	util-git.import.scm racket-kwargs.import.scm
 
 members-print.o: members-print.import.scm
 members-print.import.scm: $(MEMBERS-PRINT-SOURCES)
 
 MEMBERS-FEES-SOURCES=members-fees.scm configuration.import.scm		\
 	brmember.import.scm cal-month.import.scm table.import.scm	\
-	mbase.import.scm specification.import.scm			\
-	util-list.import.scm
+	mbase.import.scm specification.import.scm
 
 members-fees.o: members-fees.import.scm
 members-fees.import.scm: $(MEMBERS-FEES-SOURCES)
 
 MBASE-DIR-SOURCES=mbase-dir.scm testing.import.scm	\
 	util-bst-ldict.import.scm brmember.import.scm	\
-	brmember-parser.import.scm util-list.import.scm
+	brmember-parser.import.scm
 
 mbase-dir.o: mbase-dir.import.scm
 mbase-dir.import.scm: $(MBASE-DIR-SOURCES)
@@ -252,7 +245,7 @@ MEMBERS-PAYMENTS-SOURCES=members-payments.scm bank-account.import.scm	\
 	util-bst-ldict.import.scm members-fees.import.scm		\
 	cal-period.import.scm configuration.import.scm			\
 	progress.import.scm bank-fio.import.scm				\
-	specification.import.scm util-list.import.scm
+	specification.import.scm
 
 members-payments.o: members-payments.import.scm
 members-payments.import.scm: $(MEMBERS-PAYMENTS-SOURCES)
@@ -262,9 +255,9 @@ ENVIRONMENT-SOURCES=environment.scm ansi.import.scm
 environment.o: environment.import.scm
 environment.import.scm: $(ENVIRONMENT-SOURCES)
 
-MAILMAN2-SOURCES=mailman2.scm util-bst-lset.import.scm		\
-	util-io.import.scm util-list.import.scm			\
-	mailman-common.import.scm configuration.import.scm
+MAILMAN2-SOURCES=mailman2.scm util-bst-lset.import.scm	\
+	util-io.import.scm mailman-common.import.scm	\
+	configuration.import.scm
 
 mailman2.o: mailman2.import.scm
 mailman2.import.scm: $(MAILMAN2-SOURCES)
@@ -473,11 +466,6 @@ BOX-DRAWING-SOURCES=box-drawing.scm util-utf8.import.scm	\
 box-drawing.o: box-drawing.import.scm
 box-drawing.import.scm: $(BOX-DRAWING-SOURCES)
 
-UTIL-LIST-SOURCES=util-list.scm testing.import.scm duck.import.scm
-
-util-list.o: util-list.import.scm
-util-list.import.scm: $(UTIL-LIST-SOURCES)
-
 EXPORT-WEB-STATIC-SOURCES=export-web-static.scm brmember.import.scm	\
 	util-dir.import.scm mbase.import.scm				\
 	members-payments.import.scm cal-day.import.scm			\
@@ -527,8 +515,7 @@ util-bst-ldict.o: util-bst-ldict.import.scm
 util-bst-ldict.import.scm: $(UTIL-BST-LDICT-SOURCES)
 
 UTIL-BST-LSET-SOURCES=util-bst-lset.scm util-bst.import.scm	\
-	racket-kwargs.import.scm util-bst-ldict.import.scm	\
-	util-list.import.scm
+	racket-kwargs.import.scm util-bst-ldict.import.scm
 
 util-bst-lset.o: util-bst-lset.import.scm
 util-bst-lset.import.scm: $(UTIL-BST-LSET-SOURCES)
@@ -547,8 +534,7 @@ mailman-common.o: mailman-common.import.scm
 mailman-common.import.scm: $(MAILMAN-COMMON-SOURCES)
 
 MAILMAN3-SOURCES=mailman3.scm configuration.import.scm	\
-	util-io.import.scm mailman3-sql.import.scm	\
-	util-list.import.scm
+	util-io.import.scm mailman3-sql.import.scm
 
 mailman3.o: mailman3.import.scm
 mailman3.import.scm: $(MAILMAN3-SOURCES)
diff --git a/src/ansi.scm b/src/ansi.scm
index d59e8bc..0d94e74 100644
--- a/src/ansi.scm
+++ b/src/ansi.scm
@@ -50,7 +50,7 @@
 	 (chicken string)
 	 (chicken irregex)
 	 (chicken keyword)
-	 util-list
+	 srfi-1
 	 testing)
 
  ;; Only basic ANSI colors and bold attribute support.
diff --git a/src/brmember-parser.scm b/src/brmember-parser.scm
index bcfb988..8068404 100644
--- a/src/brmember-parser.scm
+++ b/src/brmember-parser.scm
@@ -36,7 +36,7 @@
 	 (chicken io)
 	 (chicken irregex)
 	 (chicken string)
-	 util-list
+	 srfi-1
 	 brmember
 	 testing
 	 util-bst-ldict
diff --git a/src/brmember.scm b/src/brmember.scm
index 97651cd..8603e36 100644
--- a/src/brmember.scm
+++ b/src/brmember.scm
@@ -94,7 +94,7 @@
 	 (chicken irregex)
 	 (chicken string)
 	 (chicken format)
-	 util-list
+	 srfi-1
 	 util-bst-ldict
 	 testing
 	 cal-month
diff --git a/src/command-line.scm b/src/command-line.scm
index 8bc5e65..6d66d7e 100644
--- a/src/command-line.scm
+++ b/src/command-line.scm
@@ -40,7 +40,7 @@
 	 (chicken base)
 	 (chicken process-context)
 	 (chicken format)
-	 util-list
+	 srfi-1
 	 testing
 	 util-proc)
 
diff --git a/src/gendoc.scm b/src/gendoc.scm
index cf91230..e5afddc 100644
--- a/src/gendoc.scm
+++ b/src/gendoc.scm
@@ -26,7 +26,6 @@
 	  util-io
 	  util-stdout
 	  util-parser
-	  util-list
 	  util-proc
 	  util-format
 	  util-tag
diff --git a/src/mailman2.scm b/src/mailman2.scm
index e5d7c24..5825165 100644
--- a/src/mailman2.scm
+++ b/src/mailman2.scm
@@ -41,7 +41,7 @@
 	 (chicken string)
 	 (chicken sort)
 	 (chicken format)
-	 util-list
+	 srfi-1
 	 util-bst-lset
 	 util-io
 	 mailman-common
diff --git a/src/mailman3.scm b/src/mailman3.scm
index 622860f..571398d 100644
--- a/src/mailman3.scm
+++ b/src/mailman3.scm
@@ -42,7 +42,7 @@
 	 (chicken format)
 	 configuration
 	 util-io
-	 util-list
+	 srfi-1
 	 mailman3-sql)
 
  ;; Just a convenient converter
diff --git a/src/mbase-dir.scm b/src/mbase-dir.scm
index 78643ea..7c7e51c 100644
--- a/src/mbase-dir.scm
+++ b/src/mbase-dir.scm
@@ -40,7 +40,7 @@
 	 (chicken file)
 	 (chicken format)
 	 (chicken irregex)
-	 util-list
+	 srfi-1
 	 testing
 	 util-bst-ldict
 	 brmember
diff --git a/src/mbase.scm b/src/mbase.scm
index 112dcb0..11ed2d5 100644
--- a/src/mbase.scm
+++ b/src/mbase.scm
@@ -69,7 +69,7 @@
 	 (chicken string)
 	 (chicken random)
 	 (chicken sort)
-	 util-list
+	 srfi-1
 	 testing
 	 util-bst-ldict
 	 primes
diff --git a/src/members-fees.scm b/src/members-fees.scm
index c0a16aa..1d92ab9 100644
--- a/src/members-fees.scm
+++ b/src/members-fees.scm
@@ -46,7 +46,7 @@
 	 (chicken base)
 	 (chicken format)
 	 (chicken sort)
-	 util-list
+	 srfi-1
 	 configuration
 	 brmember
 	 cal-month
diff --git a/src/members-payments.scm b/src/members-payments.scm
index a87d770..6f8731d 100644
--- a/src/members-payments.scm
+++ b/src/members-payments.scm
@@ -48,7 +48,7 @@
 	 (chicken process-context)
 	 (chicken pathname)
 	 (chicken condition)
-	 util-list
+	 srfi-1
 	 bank-account
 	 brmember
 	 mbase
diff --git a/src/members-print.scm b/src/members-print.scm
index e97a555..3fdf736 100644
--- a/src/members-print.scm
+++ b/src/members-print.scm
@@ -48,7 +48,7 @@
 	 (chicken string)
 	 (chicken sort)
 	 (chicken format)
-	 util-list
+	 srfi-1
 	 util-bst-ldict
 	 brmember
 	 cal-month
diff --git a/src/primes.scm b/src/primes.scm
index 98e2920..74c26db 100644
--- a/src/primes.scm
+++ b/src/primes.scm
@@ -35,7 +35,7 @@
 
  (import scheme
 	 (chicken base)
-	 util-list
+	 srfi-1
 	 testing)
 
  ;; Checks whether given number is prime by checking the remainder of
diff --git a/src/util-bst-lset.scm b/src/util-bst-lset.scm
index b8d72ff..48bf226 100644
--- a/src/util-bst-lset.scm
+++ b/src/util-bst-lset.scm
@@ -25,7 +25,7 @@
 	 util-bst
 	 racket-kwargs
 	 util-bst-ldict
-	 util-list)
+	 srfi-1)
 
  (define* (make-lset (equality? equal?))
    (make-bst 'lset equality? ldict<?))
diff --git a/src/util-list.scm b/src/util-list.scm
deleted file mode 100644
index eb86c9f..0000000
--- a/src/util-list.scm
+++ /dev/null
@@ -1,69 +0,0 @@
-;;
-;; util-list.scm
-;;
-;; Various utilities so that no external libraries are needed.
-;;
-;; ISC License
-;;
-;; Copyright 2023 Brmlab, z.s.
-;; Dominik Pantůček <dominik.pantucek@trustica.cz>
-;;
-;; Permission to use, copy, modify, and/or distribute this software
-;; for any purpose with or without fee is hereby granted, provided
-;; that the above copyright notice and this permission notice appear
-;; in all copies.
-;; 
-;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
-;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
-;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
-;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
-;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
-;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
-;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
-;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-;;
-
-(declare (unit util-list))
-
-(import duck)
-
-(module*
- util-list
- #:doc ("This module implements basic list functionality which is common in
-most scheme implementations.")
- (
-  filter
-  util-list-tests!
-  )
-
- (import scheme
-	 (chicken base)
-	 (chicken io)
-	 (chicken process)
-	 testing)
-
- (define/doc (filter pred? lst)
-   ("* ```pred?``` - procedure accepting any value and returning #t or #f
-* ```lst``` - list to be filtered
-
-Returns a list containing only elements matching given ```pred?```
-predicate.")
-   (let loop ((lst lst)
-	      (res '()))
-     (if (null? lst)
-	 (reverse res)
-	 (if (pred? (car lst))
-	     (loop (cdr lst)
-		   (cons (car lst) res))
-	     (loop (cdr lst)
-		   res)))))
-
- ;; Performs utils module self-tests.
- (define (util-list-tests!)
-   (run-tests
-    util-list
-    (test-equal? filter (filter odd? '(1 2 3 4)) '(1 3))
-    (test-equal? filter (filter odd? '(2 4)) '())
-    ))
-
- )