diff --git a/tests/p_postfix/20_postfix_mta.sh b/tests/p_postfix/20_postfix_mta.sh
index 4c26cdc..3103bf2 100755
--- a/tests/p_postfix/20_postfix_mta.sh
+++ b/tests/p_postfix/20_postfix_mta.sh
@@ -2,6 +2,7 @@
 # Author: Christoph Galuschka <christoph.galuschka@chello.at>
 
 t_Log "Running $0 - postfix can accept and deliver local email."
+ret_val=1
 
 # send mail to localhost
 mail=$(echo -e "helo localhost\nmail from: root@localhost\nrcpt to: root@localhost\ndata\nt_functional test\n.\nquit\n" | nc -w 5 localhost 25 | grep queued)
diff --git a/tests/p_postfix/30_postfix_mta_ehlo.sh b/tests/p_postfix/30_postfix_mta_ehlo.sh
index a7f9e85..9f7fdb6 100755
--- a/tests/p_postfix/30_postfix_mta_ehlo.sh
+++ b/tests/p_postfix/30_postfix_mta_ehlo.sh
@@ -2,6 +2,7 @@
 # Author: Christoph Galuschka <christoph.galuschka@chello.at>
 
 t_Log "Running $0 - postfix can accept and deliver local email using ESMTP."
+ret_val=1
 
 # send mail to localhost
 mail=$(echo -e "ehlo localhost\nmail from: root@localhost\nrcpt to: root@localhost\ndata\nt_functional test\n.\nquit\n" | nc -w 5 localhost 25 | grep queued)
diff --git a/tests/p_sendmail/20_sendmail_mta.sh b/tests/p_sendmail/20_sendmail_mta.sh
index 59116a1..b972549 100755
--- a/tests/p_sendmail/20_sendmail_mta.sh
+++ b/tests/p_sendmail/20_sendmail_mta.sh
@@ -2,6 +2,7 @@
 # Author: Christoph Galuschka <christoph.galuschka@chello.at>
 
 t_Log "Running $0 - sendmail can accept and deliver local email."
+ret_val=1
 
 # send mail to localhost
 mail=$(echo -e "helo localhost\nmail from: root@localhost\nrcpt to: root@localhost\ndata\nt_functional test\n.\nquit\n" | nc -w 5 localhost 25 | grep accepted)
diff --git a/tests/p_sendmail/30_sendmail_mta_ehlo.sh b/tests/p_sendmail/30_sendmail_mta_ehlo.sh
index 0906b2a..106a3e7 100755
--- a/tests/p_sendmail/30_sendmail_mta_ehlo.sh
+++ b/tests/p_sendmail/30_sendmail_mta_ehlo.sh
@@ -2,6 +2,7 @@
 # Author: Christoph Galuschka <christoph.galuschka@chello.at>
 
 t_Log "Running $0 - sendmail can accept and deliver local email."
+ret_val=1
 
 # send mail to localhost
 mail=$(echo -e "ehlo localhost\nmail from: root@localhost\nrcpt to: root@localhost\ndata\nt_functional test\n.\nquit\n" | nc -w 5 localhost 25 | grep accepted)