Messaging + PHPMailer + Mime Mail + MailQ = ?

Hi.

I'm using the following modules on a site in development:
- PHPMailer - So we can send emails using Google's SMTP;
- Mime Mail - For sending HTML email;
- Messaging & Notifications - For use with OG Notifications. Messaging can be configured to send a number of emails at each cron run.

As we are sending emails through Google's SMTP (which limits to 500 emails/day) and also using Messaging (that configures the number of emails by cron run), so there's still the need to queue other emails, as the ones sent by core system or contact forms. For these, I thought about using MailQ.
The question is: can this combination of modules cause some issues? Messaging mails will also be added to MailQ queue?

Thanks!