diff --git a/server/mail/postfix.xml b/server/mail/postfix.xml
index 9648b17954..9ca6f6b2f7 100644
--- a/server/mail/postfix.xml
+++ b/server/mail/postfix.xml
@@ -97,7 +97,8 @@
       <xref linkend="icu"/> for Email Address Internationalization (SMTPUTF8) support,
       <xref linkend="mariadb"/> or <ulink url="https://www.mysql.com/">MySQL</ulink>,
       <xref linkend="openldap"/>,
-      <xref linkend="pcre"/>,
+      <xref linkend="pcre2"/> (<emphasis>or</emphasis> the deprecated <xref
+      role='nodep' linkend='pcre'/>),
       <xref linkend="postgresql"/>,
       <xref linkend="sqlite"/>, and
       <ulink url="https://cr.yp.to/cdb.html">CDB</ulink> or