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diff --git a/lib/Lintian/Data/Provides/MailTransportAgent.pm b/lib/Lintian/Data/Provides/MailTransportAgent.pm
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+++ b/lib/Lintian/Data/Provides/MailTransportAgent.pm
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+# -*- perl -*-
+#
+# Copyright (C) 2008 Niko Tyni
+# Copyright (C) 2018 Chris Lamb <lamby@debian.org>
+# Copyright (C) 2021 Felix Lechner
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the Free
+# Software Foundation; either version 2 of the License, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package Lintian::Data::Provides::MailTransportAgent;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Carp qw(carp);
+use Const::Fast;
+use List::SomeUtils qw(first_value any);
+use Path::Tiny;
+use Unicode::UTF8 qw(encode_utf8);
+
+use Moo;
+use namespace::clean;
+
+const my $SLASH => q{/};
+
+const my $NEWLINE => qq{\n};
+
+=head1 NAME
+
+Lintian::Data::Provides::MailTransportAgent - Lintian interface for mail transport agents.
+
+=head1 SYNOPSIS
+
+    use Lintian::Data::Provides::MailTransportAgent;
+
+=head1 DESCRIPTION
+
+This module provides a way to load data files for mail transport agents.
+
+=head1 INSTANCE METHODS
+
+=over 4
+
+=item title
+
+=item location
+
+=item mail_transport_agents
+
+=item deb822_by_installable_name
+
+=cut
+
+has title => (
+    is => 'rw',
+    default => 'Mail Transport Agents'
+);
+
+has location => (
+    is => 'rw',
+    default => 'fields/mail-transport-agents'
+);
+
+has mail_transport_agents => (is => 'rw', default => sub { [] });
+
+=item all
+
+=cut
+
+sub all {
+    my ($self) = @_;
+
+    return keys %{$self->mail_transport_agents};
+}
+
+=item load
+
+=cut
+
+sub load {
+    my ($self, $search_space, $our_vendor) = @_;
+
+    my @candidates = map { $_ . $SLASH . $self->location } @{$search_space};
+    my $path = first_value { -e } @candidates;
+
+    unless (length $path) {
+        carp encode_utf8('Unknown data file: ' . $self->location);
+        return 0;
+    }
+
+    open(my $fd, '<:utf8_strict', $path)
+      or die encode_utf8("Cannot open $path: $!");
+
+    my $position = 1;
+    while (my $line = <$fd>) {
+
+        # trim both ends
+        $line =~ s/^\s+|\s+$//g;
+
+        next
+          unless length $line;
+
+        next
+          if $line =~ m{^ [#]}x;
+
+        my $agent = $line;
+
+        push(@{$self->mail_transport_agents}, $agent);
+
+    } continue {
+        ++$position;
+    }
+
+    close $fd;
+
+    return 1;
+}
+
+=item refresh
+
+=cut
+
+sub refresh {
+    my ($self, $archive, $basedir) = @_;
+
+    my @mail_transport_agents;
+
+    # neutral sort order
+    local $ENV{LC_ALL} = 'C';
+
+    my $port = 'amd64';
+
+    my $deb822_by_installable_name
+      = $archive->deb822_packages_by_installable_name('sid', 'main', $port);
+
+    for my $installable_name (keys %{$deb822_by_installable_name}) {
+
+        my $deb822 = $deb822_by_installable_name->{$installable_name};
+
+        my @provides = $deb822->trimmed_list('Provides', qr{ \s* , \s* }x);
+
+        push(@mail_transport_agents, $installable_name)
+          if any { $_ eq 'mail-transport-agent' } @provides;
+    }
+
+    my $text = encode_utf8(<<'EOF');
+# Packages that provide mail-transport-agent
+#
+EOF
+
+    $text .= encode_utf8($_ . $NEWLINE)for sort @mail_transport_agents;
+
+    my $datapath = "$basedir/" . $self->location;
+    my $parentdir = path($datapath)->parent->stringify;
+    path($parentdir)->mkpath
+      unless -e $parentdir;
+
+    # already in UTF-8
+    path($datapath)->spew($text);
+
+    return 1;
+}
+
+=back
+
+=head1 AUTHOR
+
+Originally written by Felix Lechner <felix.lechner@lease-up.com> for Lintian.
+
+=head1 SEE ALSO
+
+lintian(1)
+
+=cut
+
+1;
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et