InterServer gives you an amazing option to create unlimited email accounts with the domain name of your hosting account. After you register with the InterServer hosting plan, create the email accounts you require on the cPanel accounts and access your webmail. Now in case you want an SSL email client to access your mails instead of webmail, you need to configure it to connect appropriately. To be precise, you will have to change the mail settings to get the email client application to connect to the SMTP server.
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Clearing up some terms
What are mail settings?
Mail settings are your username viz. your email account, password, incoming server (the hostname of the server or the SMTP server name and it needs to be connected on the IMAP port 993, 143 or POP ports 995, 110), and the outgoing server (your hostname or the SMTP server name, SMTP port 465 and 587.)