Postfix Notes

Postfix

>>To purge an item from the mailq

find the item in the mailq and type: postsuper -d queueid

>>To delete everthing in the queue

go to /var/spool/postfix

most queued mail will be in directories like /flush, /active, etc.

so if they were in /var/spool/postfix/flush/ you could issue the command:

find /var/spool/postfix/flush -type f | xargs rm

>>If there is a mail item having problems, go to /var/spool/postfix.

Type: find . -type f

to see the deferred directory location cd to the location, postcat the file

>>To search for a particular message

grep -nri "clueword" * .

(e.g., grep -nri "^Subject:.*Brim.*" .)

(The ^ means beginning of line, and the .* means to match any string of xxxx characters)

>>Adding user to sasl

saslpasswd -c -u "domain.name.com" accountname

Updating a users password in sasl

saslpasswd -u "domain.name.com" accountname

Delete user in sasl

saslpasswd -d -u "domain.name.com" accountname

Query sasldb

sasldblistusers

If I have to change the sasl database, make sure the permissions are: root.postfix and 640

After changing sasldb in /etc/ copy it to /var/spool/postfix/etc/ (cp -a to preserve permissions)

[it might be a good idea to create a soft link from /var/spool/postfix/etc/sasldb to /etc/sasldb

>>Change LDAP domain name

For Bind DN As.... Enter "cn=root,dc=domain,dc=com"

Bind password: see password file.

Create new POP3 and IMAP certificates

go to: /usr/lib/courier-imap/share/

remove the expired certs: imapd.pem and pop3d.pem

then issue the commands:

./mkimapdcert

./mkpop3dcert

• create a *.cer file from a *.pem file: openssl x509 -in my-cert.pem -inform PEM -out my-cert.cer -outform DEN

• create a *.pem file from a *.cer file: openssl x509 -in my-cert.cer -inform DEN -out my-cert.pem -outform PEM

Sophos SMTP

To change email scanning parameters:

/usr/local/sophos/mmsmtp-<version>/<platform>/mmsmtp.cfg

To stop and start email scanning:

/usr/local/sophos/mmsmtp-<version>/<platform>/bin/

mmsmtpd -terminate

mmsmtpd -start