Originally Posted by mylifenp
You need to relay the mails you are sending using your ISPs smtp. Add these two lines in your main.cf in /etc/postfix
broken_sasl_auth_clients = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_always_send_ehlo = yes
relayhost = smtp.yourisp.tld
smtpd_sasl_authenticated_header = yes
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, check_recipient_access mysql:/etc/postfix/mysql-virtual_recipient.cf, reject_unauth_destination
Then 'create /etc/postfix/sasl_passwd' and add these lines
If your ISPs SMTP server doesn't require authentification than you won't need to add 'smtp_sasl_password_maps .....' line and won't have to create 'sasl_passwd' file.
Hope this helps you.
The only problem is if you do this then your ISP will get totally ticked off at you when his IP's get blacklisted and then you really have a problem.
Is there any mechanism in ispConfig mail system that can activiated if its sees more then x emails per minute it then shoots an email to admin to warm them to take a closer look?