On Tue, Oct 19, 2021 at 10:35:41PM -0400, post...@ptld.com wrote:
> >> $ postconf smtpd_discard_ehlo_keywords
> >> smtpd_discard_ehlo_keywords = pipelining, chunking,
> >> silent-discard, DSN, ETRN
> >
> > Why did you decide to turn off PIPELINING and CHUNKING?
>
> Based on the last paragraph of BDAT_README.html I do not see any benefit
> of offering it and I assume disabling it could remove an avenue of
> abuse. I also have reject_unauth_pipelining in smtpd_data_restrictions.
> Am I causing myself a disservice by disabling it?
These PIPELINING avoids unnecessary latency in SMTP transactions, with
little downside. I am not aware of any good reasons to disable it.
The CHUNKING extension is somewhat newer, but it is becoming
increasingly mainstream. The early implementation bugs should
have been shaken out by now, or are for the broken systems to
fix.
I leave both enabled.
--
Viktor.
