Hello, and welcome!
You mention resolvers are good, and you show us you get a reverse lookup of 127.0.0.1 to localhost in 0 milliseconds, but what you didn't show is is the resolution time for test.com, the FQDN you were sending your test mail to.
I'll guess that $ dig test.com might not resolve so quickly.
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Edited to add a second guess, which is probably better.
My second guess is that you have a mismatch between the forward DNS resolution for test.com, and the reverse DNS resolution of localhost, and sendmail is therefore waiting for a resolution timeout.
Last edited by jggimi; 20th June 2015 at 01:46 PM.
Reason: added forward/reverse resolution mismatch
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