Knowledgebase

Outgoing mail is checked for:

• Authentication
• Spamlike content
• Fingerprinting and hash checks
• Viruses
• IP reputation
• Maximum email size
• Rate limits - For each user a limit can be set for the allowed number of outgoing emails per minute, and per hour.
• FROM restrictions - For each outgoing user, several restrictions can be applied (valid address, specific domain)
• Bounce address tag validation - If enabled every incoming bounce message can be checked for validity.

First you need to create an authorised outgoing user via the web interface. Go to the "Manage users" option in the outgoing section of domain-level control panel. Authentication can be one of the following:

• username@domain + password
• domain + password
• IP address

You can edit a user/IPs settings by selecting the icon. You will see the follwing options.

• Automatic Lock - This setting will cause the account to lock if abuse is detected.
• Block Outgoing Spam - Will block any mails that appear to be spam
• Out Going Limit - Restrict how many mails the user or IP can send in an hour
• User Lock Time - How long a user will be locked out for when spam is detected
• Max unlocks by timeout - How many times an account will be automatically unlocked before being permanently locked (requiring manual intervention)
• Require FROM domain - Forces the account to only send from a particular domain. This is recommended.
• Valid Sender Address Required - Mail will only be accepted from a real email address
• DKIM selector - Select a Domain Key for authenticating the mail
• Maximum Recipients per day - Restict the number of different destin ation addresses in a day. Spammers will target many different addresses in a short time
• Invalid Recipient Limit - Resticts the account if this number of bad addresses are attempted.

A user can connect directly to the outgoing mail service from their mail client or the outgoing mail service can be used as a smarthost for other mail servers.

You will have to connect with SMTP to the outgoing cluster hostname on port 587. If you wish you may use STARTTLS for SSL encypted sending.