I would like to send directly through gmail, since we have google apps and use gmail as our domain email.
I would like to get rid of sendgrid so I can possibly not be marked as spam.
I found this https://rtcamp.com/tutorials/linux/ubuntu-postfix-gmail-smtp/ which shows how to setup postfix to use gmail smtp, but shows that it uses port 587, and I know that my current setup with sendgrid uses port 2525.
Is it possible to push like this through gmail?