Yes you are right. When I checked the Landing page domain name from admin point of view (settings) I see that its using the same domain. Ideally, according to you what should be the best practise in this case? You must choose a new LP subdomain (pages.example.com) and email tracking (so called "branding") subdomain (em.example.com). Each subdomain will require a corresponding DNS alias record (CNAME RR) to be created: LP subdomain is an alias for the CNAME{account string}.mktoweb.com, Account String is under Admin » Landing Pages email tracking subdomain is an alias for the CNAME{tracking link}, Tracking Link under Admin » Email Note, because this is so frequently and frustratingly miscommunicated, neither the LP subdomain nor email tracking subdomain is "a CNAME". They doappear in a CNAME record but are not CNAMEs, they are aliases. The CNAME is the right-hand side: the *.mktoweb.com or mkto-*.com. You will also need to set up a DNS DKIM record (TXT RR) for the new From/Reply-To email domain, as Marketo provides in the Admin » Email » SPF/DKIM section. (As you are on a shared instance, you do not need to add to the SPF record for the new domain.) This is exactly the same setup you would use when setting up Marketo for the first time, there's no difference as you're changing every primary domain.
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