Postfix exit status 127 on Plesk 12.0.18 CentoOS5

[Larry the Leprechaun]

Frantic as have been unable to get successful SMTP on our business server for 3 days.
This seems to have started after the weekly server restart at around 4am this Sunday
Maillogs started to show this immediately after restart:

Apr 25 04:06:52 server217-174-253-120 master[3441]: fatal: master_spawn: exec /usr/libexec/postfix/smtpd: No such file or directory
Apr 25 04:06:53 server217-174-253-120 postfix/master[11449]: warning: process /usr/libexec/postfix/smtpd pid 3441 exit status 1
Apr 25 04:06:53 server217-174-253-120 postfix/master[11449]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling

Replaced /usr/libexec/postfix/smtpd by copying it from another server (it is the same version etc) and running postfix set_permissions

Postfix smptd now launches but all processes are now failing with a generic exit code 127:

Apr 26 13:53:09 web1 postfix/master[9231]: daemon started -- version 2.8.17, configuration /etc/postfix
Apr 26 13:53:11 web1 courier-authdaemon: stopping authdaemond children
Apr 26 13:53:11 web1 courier-authdaemon: modules="authpsa ", daemons=5
Apr 26 13:53:11 web1 courier-authdaemon: Installing libauthpsa
Apr 26 13:53:11 web1 courier-authdaemon: Installation complete: authpsa
Apr 26 13:53:11 web1 /usr/lib64/plesk-9.0/psa-pc-remote[29877]: PleskFilter: mi_stop=1
Apr 26 13:54:02 web1 postfix/master[9231]: warning: process /usr/libexec/postfix/smtpd pid 10206 exit status 127
Apr 26 13:54:02 web1 postfix/master[9231]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling
Apr 26 13:55:02 web1 postfix/master[9231]: warning: process /usr/libexec/postfix/smtpd pid 11316 exit status 127
Apr 26 13:55:02 web1 postfix/master[9231]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling


Have swapped to qmail in Plesk which works, but swapped back to Postfix, ran mchk, still no joy.

Getting a bit desperate now

 

[IgorG]

Have you tried

# plesk repair mail

?

 

[Larry the Leprechaun]

Hi Igor,

I have run that and received
PHP Notice: Undefined index: mail in /usr/sbin/plesk on line 57

15:30 26/04 : In a strange update to this saga, we 'fixed' the problem by swapping to qmail
and left it overnight.

08.30 27/04 : This morning, mail is no longer working, SMTP with Qmail has shut itself off overnight and in :8443/plesk/server/services/ we cannot restart the SMTP (Qmail) (same problem as we had with Postfix yesterday)

09.00 27/04 : I have just swapped back to Postfix to run the command you mentioned above, and I am now going to switch back to Qmail again to see if it will restart and run... Obviously something is rather more amiss than it first seemed. This is a remote dedicated server that was only activated last month when migrated to from a much older server.

-----------------
Further update 09.50 27/04 : swapped back to Qmail and that is now working, I just wonder how long for.