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MeTA1 is a message transfer agent that has been designed with these main topics in minds:
* Security
* Reliability
* Efficiency
* Configurability
* Extendibility
MeTA1 consists of five main modules of which only one runs as root:
* mcp: the main control program is similar to inetd(8): it starts all other MeTA1 modules and watches over their
execution. mcp runs as root in order to bind to port 25 and to change the uid of the processes it starts.
* smtps: the SMTP server receives e-mails.
* smtpc: the SMTP client sends e-mails.
* smar: the address resolver provides lookups in various maps including DNS for mail routing.
* qmgr: the queue manager controls the flow of e-mails through the SMTP servers and clients.
A MemberAdapter and cronjob to contact an ldap server for mailman
These are two modules: the first is a MemberAdaptor for mailman that reads a file of members for each mailing list. The other is a cronjob that contacts an ldap server and
* writes an aliases file for each user that has uid and mail entries in ldap, to be used with postfix
* maintains lists that are defined via ldap with GroupOfNames and write the files for the first module
If the ldap server is inaccessible, the files are left in place, so mails still get delivered.
LDAP Users Admin is a Webmin module for those who use LDAP directories (like OpenLDAP) for user account information or as an e-mail address book. It'll take care of common tasks such as getting an unused UID, editting address book fields and the like.