Thank you On Mon, Jul 3, 2023, 3:41 PM Michael Stauber via Blueonyx < blueonyx@mail.blueonyx.it> wrote:
> Hi Tim, > > > 5210R > > > > I am pondering switching from sendmail to postfix. > > > > Anything that I should be aware of with regard to what is going to > > change regarding my client's email client setups? > > > > Is there anything that they will have to change in their settings? > > > > Can I switch back if I suddenly run into issues (my clients) > > On 5210R/5211R you can switch between Sendmail and Postfix at any time > and in either direction. Typically the clients won't even notice and no > config changes are required server side or client side. > > The main difference between Sendmail and Postfix (as far as BlueOnyx > goes) is this: > > Postfix supports SNI. So it will make use of *all* SSL certificates. > That includes the GUI's cert and the SSL cert of all Vsites that have > SSL enabled. > > Whereas Sendmail could only use a single SSL certificate and therefore > only used the GUI's SSL cert. > > With Postfix your clients (who have SSL enabled on their Vsite) no > longer get an SSL certificate mismatch if they use SMTPS, POPS or IMAPS > and their configured mail-endpoint on the BlueOnyx is the domain name of > their Vsite. > > Of course: If you ever have clients who use *that* setup and switch back > from Postfix to Sendmail? Yeah, then they get the "certificate mismatch" > again, because Sendmail only uses the GUI cert, which doesn't have > provisions for any Vsite SSL. > > Other than that? Postfix is more robust and takes abuse a lot better > than Sendmail. The way we have Postfix set up on BlueOnyx is that each > time when Postfix is started it parses the Sendmail configuration and > creates a new Postfix configuration on the fly. That way the > configuration of both MTAs remains identical and "doesn't drift apart". > > Should you ever wish to configure Postfix differently than the GUI > allows, or want to set a parameter that the GUI doesn't have for the > Postfix configuration? You can put your changes into this script, which > will never be overwritten by YUM updates: > > /usr/sausalito/bin/custom-postfix-confgen.sh > > There is an example in that file that shows how it's done. This script > runs at the end of the auto-configure of Postfix that happens during > each Postfix restart. So you have full flexibility of how you want to > configure that service if you want to tweak it further than the GUI allows. > > Let me know if you have any further questions and I'd be glad to help. > > -- > With best regards > > Michael Stauber > _______________________________________________ > Blueonyx mailing list > Blueonyx@mail.blueonyx.it > http://mail.blueonyx.it/mailman/listinfo/blueonyx >
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