diff --git a/configure.ac b/configure.ac
index f67ccb06800af5f3281b8a9c181a44e7d03bf660..8ae8077317d846f470a160f530af602f2c2f6dea 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2559,12 +2559,21 @@ if test "x$CURL_DISABLE_TFTP" != "x1"; then
 fi
 if test "x$CURL_DISABLE_POP3" != "x1"; then
   SUPPORT_PROTOCOLS="$SUPPORT_PROTOCOLS POP3"
+  if test "x$SSL_ENABLED" = "x1"; then
+    SUPPORT_PROTOCOLS="$SUPPORT_PROTOCOLS POP3S"
+  fi
 fi
 if test "x$CURL_DISABLE_IMAP" != "x1"; then
   SUPPORT_PROTOCOLS="$SUPPORT_PROTOCOLS IMAP"
+  if test "x$SSL_ENABLED" = "x1"; then
+    SUPPORT_PROTOCOLS="$SUPPORT_PROTOCOLS IMAPS"
+  fi
 fi
 if test "x$CURL_DISABLE_SMTP" != "x1"; then
   SUPPORT_PROTOCOLS="$SUPPORT_PROTOCOLS SMTP"
+  if test "x$SSL_ENABLED" = "x1"; then
+    SUPPORT_PROTOCOLS="$SUPPORT_PROTOCOLS SMTPS"
+  fi
 fi
 if test "x$USE_LIBSSH2" = "x1"; then
   SUPPORT_PROTOCOLS="$SUPPORT_PROTOCOLS SCP"