Add PowerMTA Mailmerge as a sending option to Interspire Email Marketer 6.1.3

Currently Interspire Email Marketer 6.1.3 (IEM) allows only standard SMTP as a sending option. This job is to modify it, via an Add-on if possible, to use the extra SMTP verbs present in PowerMTA's (PMTA - [login to view URL]) mail merge API. All existing capabilities within IEM should continue to function normally, and the variables for custom fields and variables inside of IEM should correspond to XFDN definitions. That is, if an email has the format: example: --------------------------- Hello %%First Name%%, Hello to all our subscribers in %%City%%. Example text, etc... %%[Signature_Dynamic_Block]%% Unsubscribe me from this list ----------------------------- In the PMTA each of the available variables should correspond to an XFDN variable definition so the variables can be included efficiently during a mail merge. example XFDN: XDFN firstname="Bob" City=Austin XDFN *jobid="'.$strippeddomain.(int)$this->statid;" (make the jobid the domain where the IEM instance is installed + the statid XDFN unsubscribelink="kjsdhfkjsdhfk1223jsdf1244" RCPT TO: Interspire Email Marketer, like most newsletter/email campaign software, currently merges these into the email itself but mails them one at a time. The goal here is to get it to pass these variables to PowerMTA and use its mail merge SMTP verbs to effect faster sending. *Note that the accepted variable names are different between IEM and PMTA so some mapping will have to be done to account for IEM variables with spaces. ** Futher note: We will provide you with access to a testing environment.