hey guys, 
i am setting up email relay in salesforce but its not working.

we have mimecast SMTP server and user is created on that.

I have setup email relay, email domain filter and deliverability setting as suggested in salesforce help docs.

I am doing 'test deliverability' but receiving email from salesforce only 'noreply@salesforce.com' instead of our SMTP server.
i have checked the email log file and the error is '435 5.7.8 Authentication credentials invalid' but this is fishy because I am entering the correct username and password provided by SMTP server team, infact i asked the SMTP server team to create new user and provide, but it is still the same error.

i am no expert in reading the email log file, and i dont understand that for some row there is no entry in coloum 'M' relay address, why is that, when email relay is enabled it should be for all the email initiated form Salesforce.

what am i missing?

What is wrong? 

Hi All,
We are facing an issue where we have stopped receiving emails from salesforce altogether. We are using mimecast for email security filters and as per them they are not receiving any requests from salesforce so there is no error in the logs. Even the 'Test Deliverability' is not working. We have checked the IP whitelist and salesforce IPs are listed under that. Has anyone faced this issue or if you have any inputs please put it in the comments.
#Salesforceemails #Mimecast #Email 
 
Thanks
Shivangi