I'm seeing via 0cg7gri2umy6l.36-1gcueea0.na30.bnc.salesforce.com , This is a security feature set by Gmail which displays the full email address of the sender.
"Gmail detected that the email was sent via another mail service. This means that the sender may be using a third-party email service to generate this message. For example, the message may have been sent through a social networking site which offers an email service or sent through a mailing list that you’re subscribed to.
Gmail displays this information because many of the services that send emails on behalf of others don’t verify that the name that the sender gives matches that email address. We want to protect you against misleading messages from people pretending to be someone you know."
For more information please visit:
Gmail recipient- Why am I seeing "via" followed by d.bnc.salesforce.com.
So here you need to setup the DKIM key feature provided by saelsforce.
Check Setup DKIM key article for the steps.