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Line 30: + + − You will still have renewal issues with CACert certificates for example, as they are only valid for 6 months, unless you join the special recognition program and show proof of identity to a authorised human being in your area, when they are then valid for 2 years. Ultimately at some time in the future, you will need to renew the CACert certificate, and install that new certificate onto sme server. Then when a user's web browser accesses https for the first time, it will object to the authenticity of the new certificate, thus needing to be reinstalled again, or install the CACert root certificate again. You can't win actually as users will always be chasing their own tail reinstalling certificates, albeit infrequently !
trying to get more structure in it (headings and changed position of one paragraph)
====Certificates - All you wanted to know about them====
====Certificates - All you wanted to know about them====
=====Self signed certificates=====
The certificate created by sme by default is a self signed certificate. That means it is issued by sme server and as such has not been tested or authenticated by any external certificate issuing Authority eg Verizon & others etc.
The certificate created by sme by default is a self signed certificate. That means it is issued by sme server and as such has not been tested or authenticated by any external certificate issuing Authority eg Verizon & others etc.
Obviously external DNS records have to support that URL ie you would usually setup a wildcard in external DNS records that makes *.yourmaindomain.com resolve to your server IP.
Obviously external DNS records have to support that URL ie you would usually setup a wildcard in external DNS records that makes *.yourmaindomain.com resolve to your server IP.
=====Commercial certificates=====
If you use a commercially available certificate & pay money for it, the organisation who issues the certificate pays big money to Microsoft & Mozilla etc to have their root certificate installed in the browser by default. That's why if you use a good quality commercial certificate on your server, then when a visitor to your site accesses https://.... , they will not be asked anything about the certificate mismatching or not being installed etc, as the browser already knows that certificates from say Verizon are legitimate and happily accepts the connection without question, as it is already trusted. Same for other major brands of commercial certificates.
If you use a commercially available certificate & pay money for it, the organisation who issues the certificate pays big money to Microsoft & Mozilla etc to have their root certificate installed in the browser by default. That's why if you use a good quality commercial certificate on your server, then when a visitor to your site accesses https://.... , they will not be asked anything about the certificate mismatching or not being installed etc, as the browser already knows that certificates from say Verizon are legitimate and happily accepts the connection without question, as it is already trusted. Same for other major brands of commercial certificates.
=====Freely available certificates=====
If you choose to create your own certificate using one of the Howtos eg the [[Custom_CA_Certificate|CACert Howto]], then the first time visitors access your site (https), they will still get asked to install the certificate into their browser. This is because CACert does not pay Microsoft $10,000 or more regularly to have their root certificate automatically installed in Internet Explorer (& updates which also update the root certifcate) etc. The same goes for other major brands of web browsers, although work is progressing to improve the relationship between CACert & other free certificate issuers and various web browser authors.
If you choose to create your own certificate using one of the Howtos eg the [[Custom_CA_Certificate|CACert Howto]], then the first time visitors access your site (https), they will still get asked to install the certificate into their browser. This is because CACert does not pay Microsoft $10,000 or more regularly to have their root certificate automatically installed in Internet Explorer (& updates which also update the root certifcate) etc. The same goes for other major brands of web browsers, although work is progressing to improve the relationship between CACert & other free certificate issuers and various web browser authors.
You can refer your visitors to the CACert website and get them to install the CACert root certificate and they will no longer be questioned about the certificate on your server, as your CACert certificate is now trusted by their browser (as it has the CACert root certificate installed). You can go either way really, get users to install your CACert certificate or get them to install the CACert root certificate.
You can refer your visitors to the CACert website and get them to install the CACert root certificate and they will no longer be questioned about the certificate on your server, as your CACert certificate is now trusted by their browser (as it has the CACert root certificate installed). You can go either way really, get users to install your CACert certificate or get them to install the CACert root certificate.
You will still have renewal issues with CACert certificates for example, as they are only valid for 6 months, unless you join the special recognition program and show proof of identity to a authorised human being in your area, when they are then valid for 2 years. Ultimately at some time in the future, you will need to renew the CACert certificate, and install that new certificate onto sme server. Then when a user's web browser accesses https for the first time, it will object to the authenticity of the new certificate, thus needing to be reinstalled again, or install the CACert root certificate again. You can't win actually as users will always be chasing their own tail reinstalling certificates, albeit infrequently !
=====Expiration time of the self signed certificate=====
One last point to note is that the sme self signed certificate is valid for one year, and it gets automatically renewed by sme server functionality on the anniversary of the installation date of the sme server OS.
One last point to note is that the sme self signed certificate is valid for one year, and it gets automatically renewed by sme server functionality on the anniversary of the installation date of the sme server OS.
There is a mechanism (custom-templates) to specify how long your sme certificate will last for, eg you can change the validity to say 5 years (instead of 1 yr), if you feel that security model is acceptable, and that will save users from having to reinstall the sme certificate into their browsers every year eg they will be asked again to install it in 5 years (or less) depending when they first installed it.
There is a mechanism (custom-templates) to specify how long your sme certificate will last for, eg you can change the validity to say 5 years (instead of 1 yr), if you feel that security model is acceptable, and that will save users from having to reinstall the sme certificate into their browsers every year eg they will be asked again to install it in 5 years (or less) depending when they first installed it.
=====Problem with email client=====
Also if using the self signed certificate, instead of configuring your email client to use say mail.yourdomain.com for sending and receiving mail server names, then change that to servername.yourdomain.com, and that way the email client will not create a warning/error each time you access the mail system on your server ie by clicking the Send/Receive button in the email client ie the certificate name will match the requested server name.
Also if using the self signed certificate, instead of configuring your email client to use say mail.yourdomain.com for sending and receiving mail server names, then change that to servername.yourdomain.com, and that way the email client will not create a warning/error each time you access the mail system on your server ie by clicking the Send/Receive button in the email client ie the certificate name will match the requested server name.
=====Multiple domains=====
If you have multiple hosted domains, then you may need to use a certificate that covers all those domains, if you want users to access individual domain name URLs, the CACert How to details that.
If you have multiple hosted domains, then you may need to use a certificate that covers all those domains, if you want users to access individual domain name URLs, the CACert How to details that.
Otherwise if using the self signed certificate just get users to access https://servername.maindomain.com/webmail irregardless of whether they are using a different domain for their receiving/sending email address. In webmail, change the default senders address for each user to match the domain they are supposed to be using.
Otherwise if using the self signed certificate just get users to access https://servername.maindomain.com/webmail irregardless of whether they are using a different domain for their receiving/sending email address. In webmail, change the default senders address for each user to match the domain they are supposed to be using.
Note that sme server only has one version of webmail installed and it serves all users of all domains.
Note that sme server only has one version of webmail installed and it serves all users of all domains.
Hope all the above makes sense.
Hope all the above makes sense.