Hello Friends,

we have developed one service to send mail through SMTP settings.  My client is using Office 365 email Id. 

For Example:

username: abc@domain.com , password: XXXXXX

From email: abc@domain.com

ssl=true

hostname: smtp.office365.com

In above case,Mail successfully sent.

But as per below settings, we are getting failure in mail sending:

username: abc@domain.com , password: XXXXXX

From email: pqr@domain.com

ssl=true

hostname: smtp.office365.com

Error: "Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender"

In above case,we have used different from Name and account email id.  

Please give me some solution to solve above issue.

Thanks,

Sonal Patel

• Moved by Cindy Meister MVPMVP Friday, July 25, 2014 3:42 PM not Office API development related

Hello Sonal,

I'd recommend asking non-programming questions in the Office 2013 and Office 365 ProPlus - IT Pro General Discussions  forum instead. The current forum is for development questions, not configurations.

Hi thanks,

we have set this settings in our windows service source code to send mail. 

Thanks,

Sonal Patel

Have you solved this issue?

Have a look at posts related to the same message:

exchange "550 5.7.1 Client does not have permissions to send as this sender"

SMTP error 550 5.7.1 Client does not have permissions to send as this sender

SMTP server error: 5.7.1 Client does not have permissions to send as this sender

• Edited by Andy_mic Friday, July 25, 2014 3:28 AM

No. Still issue is not solved. 

you have provide me solution for windows user. but we are getting issue in coding with from emai and account name.

Thanks,

Sonal Patel

Hi Sonal,

The user abc@domain.com does not have Send-As permission as user pqr@domain.com

Make sure either the From email and user name are same or provide necessary send as permission.

Regards

Sachin