As we know, POP3/SMTP are technologies from the last century (1985) in an age where we interacted the Internet in a different way as we do now. However today we need a permanent and multi-device interaction. Also, we have new and increasingly stronger requirements to cope with volume, performance, availability, and ability to apply more sophisticated security policies. That´s why GMAIL - which is the most used email enterprise application - is providing the Gmail API as the preferred method to interact; This RESTful API can be used to access Gmail mailboxes and send mail. For most web applications (including mobile apps), the Gmail API is the best choice for authorized access to a user's Gmail data.
If you feel, like BBVA, your company can benefit by moving to Gmail API please support us and vote this idea.
BBVA CIB Engineering -
Architecture - Infrastructure & Service