My ISP requires that my mail server logs into a POP3 account before messages can be sent
POP before SMTP is a simple method used by some ISP’s for authenticating the client before allowing mail to be sent. WorkgroupMail does not support this as the SMTP and POP3 processes run concurrently. Contact your ISP to determine if they support SMTP authentication, which is the preferred method of authentication that is supported by WorkgroupMail. Go to the Advanced page of the ISP properties to configure WorkgroupMail to use SMTP Authentication.
Or, if you have a direct connection to the internet, you could send your mail directly, by-passing the ISP and their restrictions. Refer to the WorkgroupMail Help for further information on configuring this in WorkgroupMail.
WorkgroupMail v8 and WorkgroupMail v7 – Edit your domain properties and on the Sending tab select ‘Direct’. Then configure your Smart Host Settings with the DNS server addresses provided by your ISP.
WorkgroupMail v6 – Edit your ISP properties and on the Servers tab select ‘Send mail directly’. You will need to enter the addresses of two DNS servers, which you can obtain from your ISP.