Zentyal Forum, Linux Small Business Server

Zentyal Server => Email and Groupware => Topic started by: elzein on April 11, 2017, 04:01:37 am

Title: Block Port 25?
Post by: elzein on April 11, 2017, 04:01:37 am
Hallo All
i'm so sorry if my english is bad
i have a problem with my zentyal 4.2, my mail server is attack by spammer because some user account is weak password, but now i change password to strong n if i check mail log i have an hundred event of: authentication error

can i block port 25 from external user???

because i use webmail and mail submition (port 587) and ssl (465).
i try to disable smtp service on /Firewall/View/ExternalToEBoxRuleTable, but port 25 will prevent internal servers with local MTA to relay to Zentyal MTA so my internal server iss orror or don't rellay my mail system.