Sending email from GCE or AWS on behalf of users

An entity that can make a request for an action or operation on an AWS resource. Users, roles, federated users, and applications are all AWS principals.

Sending email from GCE or AWS on behalf of users

How could I use Google Compute Engine (or a similar service, like AWS) to send email on behalf of users via their SMTP server?

I am interested in building an online email client which allows users to enter their SMTP and POP servers and send/receive email, like they would with their desktop clients. GCE blocks all SMTP ports to prevent abuse and recommends using a mail service like SendGrid instead. However, after researching dozens of these services, they all seem to only support transactional email using their own SMTP servers, or possibly a pre-cleared smtp server. I simply want to send email using the user's SMTP server (ex smtp.mail.yahoo.com), just like they would if they were using a desktop client.

I realize I could host my own servers but I am not interested in maintaining the infrastructure. I would like to host everything on a cloud service. Is there any way I can work around Google's restrictions with an existing service?

As I'm sure you are aware, you would have to have the user enter their SMTP server information and account credentials. You would then use that information to connect to their SMTP server.

By default AWS EC2 instances have SMTP traffic on port 25 rate limited. To remove this limitation, you would need to fill out and submit the following form: https://aws-portal.amazon.com/gp/aws/html-forms-controller/contactus/ec2-email-limit-rdns-request


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