diff --git a/Sanity/basic/runtest.sh b/Sanity/basic/runtest.sh
index 2284042..e38696f 100755
--- a/Sanity/basic/runtest.sh
+++ b/Sanity/basic/runtest.sh
@@ -139,7 +139,7 @@ distribution_xcase__setup() {
                 0 "flushing mail queue, forcing mail delivery"
             ;;
         via_nc_esmtp)
-            rlRun "mkesmtp | nc localhost 25 > nc.out" \
+            rlRun "mkesmtp | while read line ; do sleep 1s ; echo "$line" ; done | nc localhost 25 > nc.out" \
                 0 "send mail via ESMTP nc connection"
             ;;
         via_gnutls_esmtps)
@@ -150,7 +150,7 @@ distribution_xcase__setup() {
                 rlFail "(TEST ERROR)"
                 return 3
             }
-            rlRun "mkesmtp | $(mkclientcmd) >client.out 2>client.err" \
+            rlRun "mkesmtp | while read line ; do sleep 1s ; echo "$line" ; done | $(mkclientcmd) >client.out 2>client.err" \
                 0 "send mail via ESMTP client connection"
             ;;
         *) distribution_xcase__id_error ;;
diff --git a/Sanity/bodycheck/runtest.sh b/Sanity/bodycheck/runtest.sh
index 45c8e44..c123f5c 100755
--- a/Sanity/bodycheck/runtest.sh
+++ b/Sanity/bodycheck/runtest.sh
@@ -115,7 +115,7 @@ EOF
     rlPhaseEnd
 
     rlPhaseStartTest
-cat << "EOF" | nc localhost 25 &> TESTOUT
+cat << "EOF" | while read line ; do sleep 1s ; echo "$line" ; done | nc localhost 25 &> TESTOUT
 EHLO aliens.outerworld
 MAIL FROM: friendly@alien.xt
 RCPT TO: info@example.com
diff --git a/Sanity/headercheck/runtest.sh b/Sanity/headercheck/runtest.sh
index de60444..a075c72 100755
--- a/Sanity/headercheck/runtest.sh
+++ b/Sanity/headercheck/runtest.sh
@@ -115,7 +115,7 @@ EOF
     rlPhaseEnd
 
     rlPhaseStartTest
-cat << "EOF" | nc localhost 25 &> TESTOUT
+cat << "EOF" | while read line ; do sleep 1s ; echo "$line" ; done | nc localhost 25 &> TESTOUT
 EHLO aliens.outerworld
 MAIL FROM: friendly@alien.xt
 RCPT TO: info@example.com
diff --git a/Sanity/virtual-MAILBOX-separate-domains-non-UNIX-accounts/runtest.sh b/Sanity/virtual-MAILBOX-separate-domains-non-UNIX-accounts/runtest.sh
index aebc8ea..32df373 100755
--- a/Sanity/virtual-MAILBOX-separate-domains-non-UNIX-accounts/runtest.sh
+++ b/Sanity/virtual-MAILBOX-separate-domains-non-UNIX-accounts/runtest.sh
@@ -102,7 +102,7 @@ EOF
     rlPhaseEnd
 
     rlPhaseStartTest
-cat << "EOF" | nc localhost 25 &> TESTOUT
+cat << "EOF" | while read line ; do sleep 1s ; echo "$line" ; done | nc localhost 25 &> TESTOUT
 EHLO root.at
 MAIL FROM: alien@redneck.com
 RCPT TO: info@example.com