Stuff…

Was receiving the following errors in the mail.log after upgrade from Ubuntu 8.04 LTS to Ubuntu 10.4 LTS:

Aug 19 12:32:55 mail postfix/pipe[2208]: 88FD22BC84: to=<user@domain>, relay=maildrop, delay=1180, delays=1180/0.02/0/0.04, dsn=4.3.0, status=deferred (temporary failure. Command output: ERR: authdaemon: s_connect() failed: Permission denied /usr/local/maildrop/bin/maildrop.bin: Temporary authentication failure. )

I had previously installed maildrop from source, but, decided to change it [...]

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The /var/spool/postfix/defer and /var/spool/postfix/deferred queues had gone crazy on a server and was filling up the log files with rubbish.  Needed to delete the defer and deferred queues.
postsuper -d ALL defer
postsuper -d ALL deferred
Did the trick nicely.  postsuper(1) appears to be quite helpful for this.

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Was using Free PHP Formmail Generator : http://phpfmg.sourceforge.net to send the contents of a form and when sending to most mail servers/mail clients it would work great.  When sending to a Microsoft Exchange server the HTML contents of the email was displayed as text (not marked up).
Tried this with PHP4 and PHP5 and had the [...]

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There is a bug in some older rulebase versions for spam assassin 3.x which will cause an extra 3.4 points to be added onto incoming mail which greatly increases the chances of the mail being marked as spam.
The rule “FH_DATE_PAST_20XX” checks to see if the email is from the future, however, since the new year [...]

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It appears that when grey listing was enabled on Plesk 9.2.3 for Fedora 8 there maybe an error in the maillog like:
handlers_stderr: qmail-inject: fatal: qq trouble in home directory
Command “/usr/local/psa/bin/grey_listing -i” showed that grey listing was running.  After disabling grey listing with “/usr/local/psa/bin/grey_listing -u -status off” this error went away.
Perhaps a grey listing bug in [...]

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