📬 Issue with Mail App Connection on Apple Devices Due to AutoSSL Certificate Domain

microvax

• July 18, 2025 16:31
• Edited

Hi there,
Some of my clients who use iPhones or Apple computers are experiencing an issue when connecting to their mail accounts via the default Mail app. The error seems to be related to the SSL certificate being generated by AutoSSL, which uses the server's hostname rather than the client's domain.

From what I understand, this mismatch causes the Mail app to reject the connection due to certificate validation errors. Is there a way to configure AutoSSL so that it uses the client’s domain instead of the server's hostname for the certificate?

Any advice or recommended configuration would be greatly appreciated.

Thanks in advance!

• 

  cPRex Jurassic Moderator

  • July 18, 2025 20:36

  Hey there!  The main thing you'll want to check is that your AutoSSL certificates are including mail.domain.com in them.  There's no reason they *have* to use that subdomain for the connection - they can just use domain.com and that should work just as well.

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  microvax

  • July 18, 2025 23:23

  I think the problem arises because www.domain.com and domain.com are hosted on a different cPanel server than the email (mail.domain.com). Therefore, AutoSSL generates the certificates correctly on the server where the website is running, but the same doesn't happen with the server where the email and webmail are running.

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  cPRex Jurassic Moderator

  • July 18, 2025 23:34

  That would definitely be an issue!

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  microvax

  • July 18, 2025 23:37

  What I did to temporarily solve the problem was use one of the free certificates generated by CloudNS to install them on the cPanel server where the mail.domain and webmail.domain subdomains work, but unfortunately, I have to manually repeat the process every 3 months.

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  cPRex Jurassic Moderator

  • July 18, 2025 23:38

  Wait until they're only good for 47 days in a few years..........

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  microvax

  • July 21, 2025 11:52

  So, is there no way to issue certificates with AutoSSL on two different servers?

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  cPRex Jurassic Moderator

  • July 21, 2025 14:07

  No - the entire point of the AutoSSL verification, whether it uses the DCV or HTTP validation, is to confirm the server really is who it says it is.  It would likely be best to purchase a certificate, possibly a wildcard, for this situation.

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