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Postfix Documentation
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How Postfix TLS support works

The diagram below shows the main elements of the Postfix TLS architecture and their relationships. Colored boxes with numbered names represent Postfix daemon programs. Other colored boxes represent storage elements.

  • The smtpd(8) server implements the SMTP over TLS server side.

  • The smtp(8) client implements the SMTP over TLS client side.

  • The tlsmgr(8) server maintains the pseudo-random number generator (PRNG) that seeds the TLS engines in the smtpd(8) server and smtp(8) client processes, and maintains the TLS session key cache files.

Network->
smtpd(8)
 
<---seed---

<-session->

tlsmgr(8)
 
---seed--->

<-session->

smtp(8)
 
->Network
/
/
|
|
\
\
smtpd
session
key cache
PRNG
state
file
smtp
session
key cache
Postfix Documentation
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