Postfix hints

I need to have reverse DNS entry for working email services!

For better compatibility with MS Outlook and working SSL on port 465

Edit master.cf and set „-o smtpd_tls_wrappermode=yes“

Determine number of emails waiting in the queue

find /var/spool/postfix/deferred -type f | wc -l

Delete outgoing emails from the queue

mailq | awk '$7 ~ /@upcmail.nl$/ { print $1 }' | tr -d '*!' | postsuper -d -

Delete by recipient

mailq | tail -n +2 | grep -v '^ *(' | awk  'BEGIN { RS = ""} $8 ~ /@aol.com$/ { print $1 }' | tr -d '*!' | postsuper -d -

Disable SSLv2

smtpd_tls_security_level = may
smtpd_tls_auth_only = yes
smtpd_tls_protocols = SSLv3, TLSv1, !SSLv2
smtpd_tls_cipherlist = ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:-LOW:-SSLv2:-EXP:-eNULL

Then do postfix reload.

/etc/init.d/postfix reload

Check if it is really disabled

openssl s_client -connect xxxxxxxxxxxxx.com:25 -starttls smtp -ssl2

I must get

CONNECTED(00000003)
write:errno=104