I removed the "-D" from master.cf & restarted postfix & stumble upon something weird just after the restart which made me believe there could be multiple smtp processes :
(btw, the shutting down flashed out as "failed" in red, while the startup flashed out as "OK" in green) : # netstat -antp | grep "25" | grep LISTEN tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 1111/master # ps -ef | grep 1111 root 1111 1 0 17:21 ? 00:00:00 /usr/libexec/postfix/master postfix 1114 1111 0 17:21 ? 00:00:00 qmgr -l -t fifo -u postfix 1115 1111 0 17:21 ? 00:00:00 pickup -l -t fifo -u postfix 1117 1111 0 17:21 ? 00:00:00 smtp -n relay -t unix -u -o smtp_fallback_relay postfix 1118 1111 0 17:21 ? 00:00:00 smtp -n relay -t unix -u -o smtp_fallback_relay postfix 1119 1111 0 17:21 ? 00:00:00 smtp -n relay -t unix -u -o smtp_fallback_relay postfix 1120 1111 0 17:21 ? 00:00:00 smtp -n relay -t unix -u -o smtp_fallback_relay postfix 1121 1111 0 17:21 ? 00:00:00 smtp -n relay -t unix -u -o smtp_fallback_relay & several seconds later, more processes came out : # ps -ef | grep 1111 root 1111 1 0 17:21 ? 00:00:00 /usr/libexec/postfix/master postfix 1114 1111 0 17:21 ? 00:00:00 qmgr -l -t fifo -u postfix 1115 1111 0 17:21 ? 00:00:00 pickup -l -t fifo -u postfix 1117 1111 0 17:21 ? 00:00:00 smtp -n relay -t unix -u -o smtp_fallback_relay postfix 1118 1111 0 17:21 ? 00:00:00 smtp -n relay -t unix -u -o smtp_fallback_relay postfix 1119 1111 0 17:21 ? 00:00:00 smtp -n relay -t unix -u -o smtp_fallback_relay postfix 1120 1111 0 17:21 ? 00:00:00 smtp -n relay -t unix -u -o smtp_fallback_relay postfix 1121 1111 0 17:21 ? 00:00:00 smtp -n relay -t unix -u -o smtp_fallback_relay postfix 1137 1111 0 17:21 ? 00:00:00 bounce -z -n defer -t unix -u postfix 1138 1111 0 17:21 ? 00:00:00 bounce -z -n defer -t unix -u postfix 1139 1111 0 17:21 ? 00:00:00 bounce -z -n defer -t unix -u postfix 1140 1111 0 17:21 ? 00:00:00 bounce -z -n defer -t unix -u postfix 1141 1111 0 17:21 ? 00:00:00 bounce -z -n defer -t unix -u postfix 1142 1111 0 17:21 ? 00:00:00 flush -z -t unix -u postfix 1143 1111 0 17:21 ? 00:00:00 flush -z -t unix -u postfix 1144 1111 0 17:21 ? 00:00:00 flush -z -t unix -u postfix 1145 1111 0 17:21 ? 00:00:00 flush -z -t unix -u postfix 1146 1111 0 17:21 ? 00:00:00 flush -z -t unix -u postfix 1147 1111 0 17:21 ? 00:00:00 flush -z -t unix -u postfix 1148 1111 0 17:21 ? 00:00:00 error -n retry -t unix -u postfix 1149 1111 0 17:21 ? 00:00:00 error -n retry -t unix -u postfix 1150 1111 0 17:21 ? 00:00:00 error -n retry -t unix -u postfix 1151 1111 0 17:21 ? 00:00:00 error -n retry -t unix -u postfix 1152 1111 0 17:21 ? 00:00:00 error -n retry -t unix -u postfix 1153 1111 0 17:21 ? 00:00:00 error -n retry -t unix -u postfix 1154 1111 0 17:21 ? 00:00:00 bounce -z -n defer -t unix -u postfix 1155 1111 0 17:21 ? 00:00:00 error -n retry -t unix -u postfix 1156 1111 0 17:21 ? 00:00:00 bounce -z -n defer -t unix -u postfix 1157 1111 0 17:21 ? 00:00:00 error -n retry -t unix -u postfix 1158 1111 0 17:21 ? 00:00:00 error -n retry -t unix -u postfix 1159 1111 0 17:21 ? 00:00:00 bounce -z -n defer -t unix -u postfix 1160 1111 0 17:21 ? 00:00:00 error -n retry -t unix -u postfix 1161 1111 0 17:21 ? 00:00:00 bounce -z -n defer -t unix -u postfix 1162 1111 0 17:21 ? 00:00:00 bounce -z -n defer -t unix -u postfix 1163 1111 0 17:21 ? 00:00:00 error -n retry -t unix -u postfix 1164 1111 0 17:21 ? 00:00:00 bounce -z -n defer -t unix -u postfix 1172 1111 0 17:22 ? 00:00:00 smtpd -n smtp -t inet -u -o stress root 1174 427 0 17:22 pts/0 00:00:00 grep 1111 # I'll see if I can uninstall (rpm -e ... ) & then reinstall "rpm -i ..." : anything else do I need to do to get a clean uninstall? I have dovecot in this box too Sun