DSCXN says,

Good, thorough in explanations and patient with an issue like this that can be confounding.

for DNS/Mail Routing Review on Mar 19, 2009

Darius_Smolka says,

Very responsive and knowledgeable, got the job done as promised. Overseen other issues on the system and fixed them. Very pleased working with Darek.

for Optimize Production Postfix mail server on Dec 09, 2007