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iPhone cannot verify server identity /SSL Trust on iPhones




if you are experiencing problems with your email on your iphone with a message coming up about trusting a server identity or SSL, this is because that now
iOS has a baked-in restriction that only one certificate can ever be force trusted for any given e-mail account.  Once one certificate has been trusted for the account the user is only ever presented with the option to view the certificate and there is no option to trust the latest one.

In order to allow trusting a certificate again, the account must be removed from the "Accounts & Passwords" section of the Settings app on the device.  As this will remove the mail associated with the account as well if your email is collected by POP3 then you should make sure you have a back-up/opy of any emails you wish to keep as these are likel to disappear also. 


Your maiil account on your device should be set up using the following details

Incoming Email:
POP3/IMAP Hostname (Incoming server): mail.(yourdomain.ext)
Username: (your full email address)
Password: (mailbox password as set in your control panel)

Outgoing Email:
SMTP Hostname (Outgoing server): mail.(yourdomain.ext)
Username: (your full email address)
Password: (mailbox password as set in your control panel)

Outbound authentication (SMTP AUTH) must also be enabled using the same credentials as the incoming server - often a switch/setting under "advanced" or "more"

How you enable SMTP AUTH depends on your email client, we have some knowledgebase articles which may help.
https://astutium.com/knowledgebase/739/How-do-I-enable-SMTP-AUTH-in-Mailapp-for-Mac.html
https://astutium.com/knowledgebase/740/How-do-I-enable-SMTP-AUTH-in-Windows-Live-Mail-.html
https://astutium.com/knowledgebase/339/How-to-configure-SMTP-Authentication-with-Outlook-Express-on-a-Mac.html
https://astutium.com/knowledgebase/540/How-do-I-change-the-outbound-SMTP-port-in-Windows-Mail-VistaorWindows-7.html

Please also ensure you do not enable SPA and disabling SSL is advised to prevent warning messages presented by some email clients.

Especially check you have SSL/TLS/encryption disabled for outbound mail (SMTP) if you're having problems as this is the cause many issues.

If you're still having problems after checking your settings please provide details of :
* which email account you're having problems with
* the public IP address of the device you're trying to send mail from (Google: what is my IP)
* copies of any error messages/numbers you receive when trying to send or receive email
* the name of the email program (client) and version you're using to read/send email
which will allow us to look into it further.





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