[BlueOnyx:26347] Re: 5210R sendmail to postfix switch questions
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 > ___ Blueonyx mailing list Blueonyx@mail.blueonyx.it http://mail.blueonyx.it/mailman/listinfo/blueonyx
[BlueOnyx:26346] Re: 5210R sendmail to postfix switch questions
At 12:46 PM 7/3/2023, Michael Stauber via Blueonyx wrote: >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. I'm not exactly sure if I can state the question clearly, so forgive if it isn't. I am about to jettison mailchimp, which was sold to me as a way to prevent email bounces, especially when some cluck marks a Newsletter as "spam" instead of unsubbing. Will 5210 and postfix give me more "secuity" that that would not happen? Or, am I way off base? ___ Blueonyx mailing list Blueonyx@mail.blueonyx.it http://mail.blueonyx.it/mailman/listinfo/blueonyx
[BlueOnyx:26345] Re: 5210R sendmail to postfix switch questions
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
[BlueOnyx:26344] 5210R sendmail to postfix switch questions
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) Thanks --Tim ___ Blueonyx mailing list Blueonyx@mail.blueonyx.it http://mail.blueonyx.it/mailman/listinfo/blueonyx
