We strongly advise all commercial , business customers to have strong anti-spam, anti-virus protection for their mail boxes. We offer SPAM EXPERTS service specially to protect the your mail box. Please visit https://www.balasai.com/addons/spam-experts/
All our mail servers run some measures to combat spam. But these measures are not adequate to identify and stop spammers in real time. To reduce spam, 1. You can create white list / black list. But this is not a one time job. You got to do it on a ongoing basis. It is difficult. 2. You should not have a catch all email account unless you are collecting all your mails for the domain and downloading it to your internal mail server. 3. Catch all email accounts receive multiples of spam, increase your mail box sizes, downloading mails becomes difficult on slow connections and you may end up exceeding your quota.