diff --git a/Esp.cf b/Esp.cf
index a86d513..e3f5d17 100644
--- a/Esp.cf
+++ b/Esp.cf
@@ -9,6 +9,8 @@ mailup_feed /etc/mail/spamassassin/mailup_id.txt
 
 maildome_feed /etc/mail/spamassassin/maildome_id.txt
 
+mailchimp_feed /etc/mail/spamassassin/mailchimp_id.txt
+
 # header	SPBL_SENDGRID_ID	eval:esp_sendgrid_check_id()
 # describe 	SPBL_SENDGRID_ID	Message from Sendgrid abused account
 
@@ -27,6 +29,9 @@ describe 	MAILUP			Message from Mailup abused account
 header		MAILDOME		eval:esp_maildome_check()
 describe 	MAILDOME		Message from Maildome abused account
 
+header		MAILCHIMP		eval:esp_mailchimp_check()
+describe 	MAILCHIMP		Message from Mailchimp abused account
+
 ifplugin Mail::SpamAssassin::Plugin::AskDNS
   askdns   RBL_SENDGRID_ID _SENDGRIDID_.rblid.domain.tld A 127.0.0.2
   describe RBL_SENDGRID_ID Invaluement Sendgrid Id blacklist
diff --git a/Esp.pm b/Esp.pm
index ec5f4b4..cfc6311 100644
--- a/Esp.pm
+++ b/Esp.pm
@@ -62,6 +62,7 @@ sub new {
   $self->register_eval_rule('esp_sendinblue_check',  $Mail::SpamAssassin::Conf::TYPE_HEAD_EVALS);
   $self->register_eval_rule('esp_mailup_check',  $Mail::SpamAssassin::Conf::TYPE_HEAD_EVALS);
   $self->register_eval_rule('esp_maildome_check',  $Mail::SpamAssassin::Conf::TYPE_HEAD_EVALS);
+  $self->register_eval_rule('esp_mailchimp_check',  $Mail::SpamAssassin::Conf::TYPE_HEAD_EVALS);
   # XXX Deprecated subs
   $self->register_eval_rule('sendgrid_check_domain',  $Mail::SpamAssassin::Conf::TYPE_HEAD_EVALS);
   $self->register_eval_rule('sendgrid_check_id',  $Mail::SpamAssassin::Conf::TYPE_HEAD_EVALS);
@@ -88,6 +89,9 @@ endif
 
 Usage:
 
+  esp_mailchimp_check()
+    Checks for Mailchimp abused accounts
+
   esp_maildome_check()
     Checks for Maildome abused accounts
 
@@ -134,6 +138,10 @@ A file with abused Mailup accounts.
 
 A file with abused Maildome accounts.
 
+=item mailchimp_feed [...]
+
+A file with abused Mailchimp accounts.
+
 =back
 
 =head1 TEMPLATE TAGS
@@ -171,6 +179,9 @@ MAILUPID
 =item *
 MAILDOMEID
 
+=item *
+MAILCHIMPID
+
 =back
 
 =cut
@@ -209,6 +220,12 @@ sub set_config {
     type => $Mail::SpamAssassin::Conf::CONF_TYPE_STRING,
     }
   );
+  push(@cmds, {
+    setting => 'mailchimp_feed',
+    is_admin => 1,
+    type => $Mail::SpamAssassin::Conf::CONF_TYPE_STRING,
+    }
+  );
   $conf->{parser}->register_commands(\@cmds);
 }
 
@@ -219,6 +236,7 @@ sub finish_parsing_end {
   $self->_read_configfile('sendinblue_feed', 'SENDINBLUE');
   $self->_read_configfile('mailup_feed', 'MAILUP');
   $self->_read_configfile('maildome_feed', 'MAILDOME');
+  $self->_read_configfile('mailchimp_feed', 'MAILCHIMP');
 }
 
 sub _read_configfile {
@@ -413,9 +431,8 @@ sub esp_maildome_check {
   if((not defined $xmailer) or ($xmailer !~ /MaildomeMTA/)) {
     return;
   }
-  # All Mailup emails have the X-Abuse header that must match
-  $maildome_id = $pms->get("List-Unsubscribe", undef);
 
+  $maildome_id = $pms->get("List-Unsubscribe", undef);
   return if not defined $maildome_id;
   $maildome_id =~ /subject=https:\/\/.*\/unsubscribe\/([0-9]+)\/([0-9]+)\/.*\/([0-9])\/([0-9]+)\>/;
   $maildome_id = $2;
@@ -433,5 +450,34 @@ sub esp_maildome_check {
     }
   }
 
+}
+
+sub esp_mailchimp_check {
+  my ($self, $pms) = @_;
+  my $mailchimp_id;
+
+  my $rulename = $pms->get_current_eval_rule_name();
+
+  # return if X-Mailer is not what we want
+  my $xmailer = $pms->get("X-Mailer", undef);
+
+  if((not defined $xmailer) or ($xmailer !~ /MailChimp Mailer/)) {
+    return;
+  }
+
+  $mailchimp_id = $pms->get("X-MC-User", undef);
+  return if not defined $mailchimp_id;
+
+  chomp($mailchimp_id);
+  if(defined $mailchimp_id) {
+    if ( exists $self->{ESP}->{MAILCHIMP}->{$mailchimp_id} ) {
+      $pms->set_tag('MAILCHIMPID', $mailchimp_id);
+      dbg("HIT! $mailchimp_id customer found in Mailchimp feed");
+      $pms->test_log("Mailchimp id: $mailchimp_id");
+      $pms->got_hit($rulename, "", ruletype => 'eval');
+      return 1;
+    }
+  }
+
 }
 1;
diff --git a/man/man3p/Mail::SpamAssassin::Plugin::Esp.3p b/man/man3p/Mail::SpamAssassin::Plugin::Esp.3p
index 997a8df..cafd3c5 100644
--- a/man/man3p/Mail::SpamAssassin::Plugin::Esp.3p
+++ b/man/man3p/Mail::SpamAssassin::Plugin::Esp.3p
@@ -133,7 +133,7 @@
 .\" ========================================================================
 .\"
 .IX Title "Esp 3"
-.TH Esp 3 "2020-11-06" "perl v5.32.0" "User Contributed Perl Documentation"
+.TH Esp 3 "2020-11-07" "perl v5.32.0" "User Contributed Perl Documentation"
 .\" For nroff, turn off justification.  Always turn off hyphenation; it makes
 .\" way too many mistakes in technical documents.
 .if n .ad l
@@ -167,6 +167,9 @@ endif
 Usage:
 .PP
 .Vb 2
+\&  esp_mailchimp_check()
+\&    Checks for Mailchimp abused accounts
+\&
 \&  esp_maildome_check()
 \&    Checks for Maildome abused accounts
 \&
@@ -206,6 +209,9 @@ A file with abused Mailup accounts.
 .IP "maildome_feed [...]" 4
 .IX Item "maildome_feed [...]"
 A file with abused Maildome accounts.
+.IP "mailchimp_feed [...]" 4
+.IX Item "mailchimp_feed [...]"
+A file with abused Mailchimp accounts.
 .SH "TEMPLATE TAGS"
 .IX Header "TEMPLATE TAGS"
 .RS 4
@@ -233,3 +239,5 @@ Tags that the plugin could set are:
 \&\s-1MAILUPID\s0
 .IP "\(bu" 4
 \&\s-1MAILDOMEID\s0
+.IP "\(bu" 4
+\&\s-1MAILCHIMPID\s0