On Thursday, 17 October 2019 9:17:04 AM AEDT Viktor Dukhovni via Exim-users wrote: > On Wed, Oct 16, 2019 at 10:04:16PM +0200, Cyborg via Exim-users wrote: > > Am 16.10.19 um 19:25 schrieb Nospam2k via Exim-users: > > > I want to use > > > mail.hosteddomainone.com <http://mail.domainone.com/> for the mail > > > server names and not maindomain.com <http://maindomain.com/> for > > > the end user. > > > > You will never know what to provide, as the servername is part of the > > initial greeting HELO. Your setup will fail every time, because it's too > > late when you find out what to use. See below why . > > This is false, neither the name in the 220 greeting (banner) nor > the initial line of the EHLO response does not preclude the server > from presenting a different name in its certificate, possibly based > on SNI. > > > > So, how do I configure exim so mail can still be accessed via tls and > > > an account can be created without any complaints about certificates from > > > Apple Mail? > > > > AppleMail and other Clients do two checks: > > > > a) check for the MX record of your domain and that the server uses this > > as hostname. > > False, only MTAs look at MX records, IMAP clients and SUBMIT clients > do not. > > > And if you can't find out, why your mailclient uses a specific name as > > server, check the autodiscover result for the domain, > > you may find a hardcoded servername there. > > For all but the largest email providers (Google, Microsoft, ...), > there is little use of "autodiscover", the user fills in the IMAP > and SMTP server names. The closest to that is: > > https://tools.ietf.org/html/rfc6186 > > IIRC it is not widely implemented. I don't think any widely used MUA uses dns autodiscovery based on SRV records. Most of them seem to follow Microsoft's autodiscover spec: https:// docs.microsoft.com/en-us/exchange/architecture/client-access/autodiscover
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