A. Schulze:
>
> Hallo,
>
> that's my (legacy) setup:
>
> a script generate 10k message files, same sender, different receiver.
> they are injected using "sendmail -t -f sender < messagefile" in the local MTA
> The MTA is configured to forward all messages to a central MSA.
>
> This MSA require authentication and STARTTLS
> All works fine, except speed.
>
> The MTA uses one SMTP-Session per message. I think the reason is documented:
> http://www.postfix.org/CONNECTION_CACHE_README.html#limitations, first bullet
>
> as expected, even "smtp_connection_cache_destinations = static:all"
> doesn't help.
>
> So what may be the strategy to speed up?
Sending MULTI-RECIPIENT messages. Postfix by default groups up to
50 recipients per transaction.
Sending non-TLS email, until OpenSSL etc. support reuse on an
open connection.
Wietse
