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After Upgrade to 10.3 - No SMTP

Powie

Regular Pleskian
After Upgrading, it's impossible to send mail.

try to telnet qmail: telnet localhost 25

result: 421 unable to read controls (#4.3.0)

have cheded other topics in the board, but no solution
 
what a bad update process to 10.3 .............

i have found that the problem is part of a lost file:

/var/qmail/control/smtpplugins

whats wrong?
 
/var/qmail/control/smtpplugins file is a part of plesk-mail-qc-driver package. Are you sure that you have correctly installed this package?
 
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