smtp recipient validation via ldap

I believe you would need to research:

 

- How do I parse SMTP

 

- How do I query and LDAP server

 

 

I believe you would need to implement both client protocols yourself.

 

 

As far as performance, I would guess your bottleneck will be your LDAP servers, not the iRule.

 

 

For the LDAP query, maybe you could also look into the APM module:

 

https://devcentral.f5.com/wiki/APM.HomePage.ashx

 

 

For SMTP, the PSM modules adds some security features to the protocol, but does not seem to add protocol parsing that can be used from iRules, like SMTP events and data structures... would be cool though.