Microsoft Outlook Autodiscover With Private Email Server

Question

I have a linux based mail server (not Microsoft Exchange) at mail.example.com

I host email for multiple domains at this server: example1.com, example2.com, example3.com, etc

I have a mail client running Outlook 2019. When the user adds a new account with their email, e.g.: [email protected] and then clicks "continue" and then "IMAP/POP", [the incoming and outgoing server fields are blank][1].

Things I have tried to get auto discover working, but don't help:

1. Hosted an autodiscover.xml file at http://autodiscover.example1.com/autodiscover/autodiscover.xml

2. Hosted an autodiscover.xml file at http://example1.com/autodiscover/autodiscover.xml

3. Followed [Thunderbird's instructions][2] and hosted a config.xml file at https://example1.com/mail/config-v1.1.xml

4. Added the following SRV records for the example1.com domain:

_imaps._tcp             IN SRV   0 1 993 mail.example.com.
_submission._tcp        IN SRV   0 1 587 mail.example.com.

my autodiscover.xml file:

<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
   <Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a">
      <Account>
         <AccountType>email</AccountType>
         <Action>settings</Action>
         <Protocol>
            <Type>IMAP</Type>
            <Server>mail.example.com</Server>
            <Port>993</Port>
            <DomainRequired>off</DomainRequired>
            <LoginName />
            <SPA>off</SPA>
            <SSL>on</SSL>
            <AuthRequired>on</AuthRequired>
         </Protocol>
         <Protocol>
            <Type>POP3</Type>
            <Server>mail.example.com</Server>
            <Port>995</Port>
            <DomainRequired>off</DomainRequired>
            <LoginName />
            <SPA>off</SPA>
            <SSL>on</SSL>
            <AuthRequired>on</AuthRequired>
         </Protocol>
         <Protocol>
            <Type>SMTP</Type>
            <Server>mail.example.com</Server>
            <Port>587</Port>
            <DomainRequired>off</DomainRequired>
            <LoginName />
            <SPA>off</SPA>
            <Encryption>SSL</Encryption>
            <AuthRequired>on</AuthRequired>
            <UsePOPAuth>off</UsePOPAuth>
            <SMTPLast>off</SMTPLast>
         </Protocol>
      </Account>
   </Response>
</Autodiscover>

my config-v1.1.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<clientConfig version="1.1">
    <emailProvider id="example.com">
        <domain>example.com</domain>
        <displayName>Company Name</displayName>
        <displayShortName>Company</displayShortName>
        <incomingServer type="imap">
            <hostname>mail.example.com</hostname>
            <port>993</port>
            <socketType>SSL</socketType>
            <authentication>password-encrypted</authentication>
            <username>%EMAILADDRESS%</username>
        </incomingServer>
        <outgoingServer type="smtp">
            <hostname>mail.example.com</hostname>
            <port>587</port>
            <socketType>STARTTLS</socketType>
            <authentication>password-encrypted</authentication>
            <username>%EMAILADDRESS%</username>
        </outgoingServer>
    </emailProvider>
    <emailProvider id="example1.com">
        <domain>example1.com</domain>
        <displayName>Company 2</displayName>
        <displayShortName>Company</displayShortName>
        <incomingServer type="imap">
            <hostname>mail.example.com</hostname>
            <port>993</port>
            <socketType>SSL</socketType>
            <authentication>password-encrypted</authentication>
            <username>%EMAILADDRESS%</username>
        </incomingServer>
        <outgoingServer type="smtp">
            <hostname>mail.example.com</hostname>
            <port>587</port>
            <socketType>STARTTLS</socketType>
            <authentication>password-encrypted</authentication>
            <username>%EMAILADDRESS%</username>
        </outgoingServer>
    </emailProvider>
</clientConfig>```


  [1]: https://i.sstatic.net/HLROe.png
  [2]: https://wiki.mozilla.org/Thunderbird:Autoconfiguration

Answer 1

from:https://docs.iredmail.org/iredmail-easy.autoconfig.autodiscover.html#setup-dns-record-for-autoconfig

How auto-discover works in Microsoft Outlook Warning

Outlook requires a valid ssl cert, a self-signed ssl cert may fail.

Without Microsoft Exchange, the order of logic that Outlook 2007 and newer releases use when trying to figure out where to get server settings is as follows:

HTTPS root domain query. Outlook uses the domain part of user email address to do this query, so it's https://customer.com/autodiscover/autodiscover.xml. If above failed, try HTTPS autodiscover domain: https://autodiscover.customer.com/autodiscover/autodiscover.xml. If above failed, try same URL but HTTP instead: http://autodiscover.customer.com/autodiscover/autodiscover.xml If all failed, try DNS SRV record: _autodiscover._tcp.customer.com. If it returns a web host name and port number, for example, mail.host.com and port number 443, then try https://mail.host.com:443/autodiscover/autodiscover.xml The ideal solution is setting DNS SRV record _autodiscover._tcp.customer.com and point to your server mail.host.com.

The autodiscover component configured by iRedMail Easy supports URLs:

https://mail.host.com/autodiscover/autodiscover.xml https://autodiscover.host.com/autodiscover/autodiscover.xml (DNS A record of autodiscover.host.com must be pointed to IP of your mail server a.b.c.d.)