Constructing list member addresses

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Discussions of Defining membership of large lists and Indirect or alternate criteria for list membership have touched on potentially complex list membership criteria, as dynamic definitions may make use of complex LDAP search filters. However, in those discussions, the list addresses and member addresses themselves were not especially complex; the topic of complexity in address forms is the topic of this discussion. Via the MTA's support for manipulating the results of LDAP URL lookups, it is possible to define list membership in ways that "construct" e-mail addresses from non e-mail address attribute values, or that obtain e-mail addresses from "external" LDAP sources. And it is also possible to define "meta-lists" where the list "address" itself is "dynamic".

A list of SMS users, adding a domain name to an SMS ID value

For instance, let us assume a setting of

msconfig> set mta.ldap_url_result_mapping mgrpURLResultMapping

or in legacy configuration, in the MTA option file:


Also assume that the MTA has an SMS channel configured with the domain associated with it for some SMSC (that is, SMS service provider), and that each user who has an account with that SMS service provider has an smsID attribute containing their SMS ID, and that an MTA mapping table has been configured:

  *|*       "$1"$Y 

Then a group for the purpose of directing an SMS message to each such user could be defined via a group entry in LDAP that includes attributes:

mgrpDeliverTo: ldap:///o=usergroup?smsID?sub 
mgrpUrlResultMapping: X-SMSID-TO-ADDRESS 

Adding different domain names to SMS IDs

At a site where users have various different SMS service providers, suppose with the domain for each service provider being stored in a SMSdomain attribute, then separate sub-lists for the different SMS service providers could be set up, with then a combined list for all the SMS users. Assuming also the following mapping table:

  *(SMSdomain=*)|*       "$2"@$1$Y 

as well as for each SMS service provider a group definition such as:

memberURL: ldap:///o=usergroup?smsID?sub?(SMSdomain=sms1-domain) 
mgrpUrlResultMapping: X-SMSID-DOMAIN-TO-ADDRESS 

Then a list of all SMS users could be defined via:


See also: