Emails from GAE do not reach receipients

[Abhai Chaudhary]

Emails generated from my GAE Application do not reach the recepients,

1) Tried my company domain : Copy on my Gmail- YES, recipient's
Corporate ID : NO, No exception reported
2) Tried Yahoo email: : Copy on my Gmail-YES, recipient's Yahoo email:
YES, All Success
3) Hotmail: Copy on my Gmail-YES, recipient's Hotmail: Send failed,
Illegal Argument Exception "Unauthorized Sender"

can someone advice how to handle this?

Thanks
-Abhai

[Calvin]

This may sound like I'm a hired shill for another company's products, but if you have to send tons of emails to recipients on various email services, I'd recommend Amazon SES.

Especially if you are using App Engine Python.  The boto lib (https://github.com/boto) can have you sending emails using SES in 30 minutes.  Also, Amazon provides instructions to add SPF info for your domain, so mails are more likely to get to the recipient (still not guaranteed though).

I was really pleased with how easy it was to implement.