are you sending it from your own email?
there's usually no solution for this, sometimes when you send email from completely legit account it still ends up in spam.
you have to just make email look like a normal email, not containing a link only.
from what i know, most email providers have spam scanners that go thru the email content and determine if its "spam" or not.
based on image to text ratio and link to text ratio ..etc
for example if you send
link here blabla.com
check this out!
then most likely it would end up in spam even from legit account.
1. try sending email that is not spam, like if you want to show your new "album" you made
and send email to your friend and ask him to check it.
once that is successful, replace that link with your fake login page
2. once you get it into inbox like that, then try modifying other content.