When setting up your email client to send and receive email over SSL the following ports will need to be used:
If you have any trouble you will want to set them back to the default ports:
You may receive a domain mismatch error in your mail client, and in that case you can change your incoming and/or outgoing server to match the secure server name of the machine your site is hosted on, for example,
Please refer to your Technical details in AMP for your server information. Keep in mind you should only use the secure server name over SSL!