Thanks Viktor. Bear with me if this is OT.
Q4: Does Redhat support postfix (ie provide patches, troubleshooting of crashes, slowness)? Q5: We are on SendMail version 3.3.4 & I think it's a commercially-added tool Flow Control version 2.1.7. Are these versions rather outdated? I won't comment on the support. Roger On Fri, Jan 23, 2015 at 11:23 PM, Viktor Dukhovni < postfix-us...@dukhovni.org> wrote: > On Fri, Jan 23, 2015 at 09:43:39PM +0800, Roger Goh wrote: > > > We are using a commercial version of sendmail (refer to sendmail.com) > > on RHEL 5.x > > > > We have seen something like 20000 mails sent to it within 5 mins & > > it just hung up or caused severe delay in delivery. > > Sendmail has no queue manager, and its congestion management is > rather crude (QueueLA, RefuseLA are not good). > > > Q1: > > Is postfix (which is now the default Smtp with RHEL 6.x) more robust ie > can > > take bursts of high > > volumes & can handle huge attachments/mails with faster deliveries? > > Yes. Postfix handles congestion gracefully. > > > Q2: > > In the past VA scans 5-10years ago, sendmail is always reported as > > something that should > > not be used. Does postfix has similar issue or it's not vulnerable to > most > > VA scans today? > > While Sendmail's history of major security issues seems to be in > the past, Postfix has no history of such vulnerabilities. However, > both Postfix and Sendmail are potentially exposed to any applicable > OpenSSL issues when linked with OpenSSL for TLS support. > > > Q3: > > Was told by our vendor that they set up 'commercial' version of sendmail > > which has a > > separate interface/module GUI for whitelisting & blacklisting. Is there > a > > commercial > > version of 'postfix' which we can get official (eg: supported by RHEL) > > support with > > add-on user-friendly interfaces/GUI? > > Some commercial email appliances are Postfix under the hood, but I am > not aware of any commercial software support for Postfix. > > -- > Viktor. >
