# Cannot send email with FB7
**URL:** https://www.finalbuilder.com/forums/t/cannot-send-email-with-fb7/1847
**Category:** Discussion
**Created:** [September 6, 2011, 9:52am UTC](https://www.finalbuilder.com/forums/t/cannot-send-email-with-fb7/1847 "2011-09-06T09:52:31Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@deleted\_user](https://www.finalbuilder.com/forums/u/deleted_user)
#### Post date: [September 6, 2011, 9:52am UTC](https://www.finalbuilder.com/forums/t/cannot-send-email-with-fb7/1847/1 "2011-09-06T09:52:31Z")
My company recently acquired a license of FB 7 in order to migrate our existing build process.
All the tasks seem to work fine, except the Send Email task. It throws the next exception:
_**9/6/2011 3:33:51 PM : 535 5.7.3 Authentication unsuccessful.
Unable to Send Message (Connect)
Authentication unsuccessful.**_
Do you have any idea on how to solve this issue?
I tested the same task (with the same configuration) on FB 4 and it works fine.
---
### Author:  [@Vincent](https://www.finalbuilder.com/forums/u/Vincent)
#### Post date: [September 7, 2011, 12:26pm UTC](https://www.finalbuilder.com/forums/t/cannot-send-email-with-fb7/1847/2 "2011-09-07T12:26:34Z")
You haven’t given us much to work with. What settings do you have on the action? What mail server are you connecting to?
---
### Author:  [@deleted\_user](https://www.finalbuilder.com/forums/u/deleted_user)
#### Post date: [September 7, 2011, 12:38pm UTC](https://www.finalbuilder.com/forums/t/cannot-send-email-with-fb7/1847/3 "2011-09-07T12:38:20Z")
I’ve already solved the problem, it was caused by an incorrect text set on the sender address of the Send Email Task settings (perhaps FB 4 was not validating or using it, but FB 7 now does and Exchange Server was not resolving that text to a valid address).
Thanks for your help.
Brgs,
Mario Covarrubias.