> Always, always log in through bookmarked links or typing them manually. Never use a link in an email unless it's in direct response to something you initiated and even then examine it carefully.
If you still want to avoid the comfort of typing in stuff manually or navigating the webinterface, logging in on a new tab and then clicking on the link is also an option.
Mini-rant here but I hate how websites for SaaS products are so over-optimized for the sales funnel. It's like giant blue button to sign up, teeny tiny link to login, if there is even one at all on any of the main pages. Often your access is on an entirely different subdomain that barely ranks on Google. If it's something that "just works" and you only access every 6 months, it's pain to go hunting through your email to rediscover if it's clients.example.com, portal.example.com, or whatever the heck it is.
I hate how many sites do that, always a signup first then a small little "Already have an account" link below that. Feels almost hostile to your existing users.
If you still want to avoid the comfort of typing in stuff manually or navigating the webinterface, logging in on a new tab and then clicking on the link is also an option.