All Barracuda Spam & Virus Firewalls in use with one or more iPhones, all firmware versions.
In order to enable mobile devices like the iPhone to send mail out through the Barracuda Spam & Virus Firewall, you'll need an authentication server. Once that's been configured, you'll need to configure the Barracuda Spam & Virus Firewall to use it when authenticating outgoing mail from external devices. To enable Outbound / Relay authentication on the Barracuda Spam & Virus Firewall, navigate to the Advanced > Outbound/Relay page, select the authentication server type (SMTP or LDAP), and configure the necessary options.
It's also important to make sure the traffic between the mobile device and the Barracuda Spam & Virus Firewall is not interrupted, so if you are using a Cisco Firewall, disable the SMTP fixup protocol (or enable the NO INSPECT ESMTP option) there. Then, go to the Advanced > SMTP/TLS page and enable TLS over SMTP (which the iPhone uses when communicating over SMTP). Lastly, you will need to change the outgoing SMTP port on the iPhone to 25 (by default, it might be set to 587), or forward incoming firewall connections on port 587 to the Barracuda Spam & Virus Firewall on port 25.
After making these changes, the iPhone should be able to relay outgoing messages through the Barracuda Spam & Virus Firewall (as long as it is able to authenticate with the authentication server).
When configuring a mail account on your iPhone, after setting up the authentication on the Barracuda Spam & Virus Firewall as above, you may need to explicitly specify the authentication method as Password. You can find this option on the iPhone under Advanced for that particular email account. Then, of course, you'll need to enter your password for that account into your iPhone.
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