php send mailing

Question

hi, I'm using PHPMailer to send email.

So in the php code I add my SMTP username, which is my gmail account and the SMTP password, which is my gmail account password.

So my GMAIL ACCOUNT ACCESS is EXPOSED in php CODE, although the server discards the php after it's been interpreted so nobody can see it, my question is, is this reliable? Should I leave my gmail access in the code or should I save it in my database?

Thanks in advance