Hi there,
Though requirements for this integration is not clear, yet i am ready to jump in.
Based on the details provided I believe you want to develop an interface for end customers to send and receive emails to gmail or outlook or anyother SMTP server. if my assumption is right, i have further question on SMTP server which you are running and also the questions about infrastructure where your code is hosted.
In nutshell, i have hands of configuring email servers MS Exchange, hMailServer, and developing mail components in the applications. I believe considering the experience in hand, i can get this job done effectively at very competitive rate, should i chance is given.
Unlike others, this response is based on thorough understanding of requirements and not a copy paste one.
Regards,