If a user sends an email from an Opportunity the sender is different in Lightning. In Classic the sender is the name of user with the org-wide email address as email while in Lightning only the org-wide email address is being used as the sender - the name of the user is not shown.
To reproduce set up an org-wide email address and then have the user set their Email Name to MyCompany | John Doe and their Email Address to [email protected] (the org-wide email address). You can find both under Settings --> Email --> My Email Settings. Then you just send a simple email from the Opportunity, selecting MyCompany | John Doe <[email protected]> as the sender.
If you now compare the email header from both tests - this is what you should get.
Classic
From MyCompany | John Doe <[email protected]>
Subject Test Classic
MIME-Version 1.0
Content-Type multipart/alternative;
X-Sender [email protected]
X-SFDC-EmailCategory emailAuthorEmail
Lightning
From "[email protected]" <[email protected]>
Subject Test Lightning
MIME-Version 1.0
Content-Type multipart/mixed;
X-Priority 3
X-Sender [email protected]
X-SFDC-EmailCategory apiSingleMail
What I find odd are the missing quotes in the from address of the test in Classic - but aside from that you can clearly see that they are different. Then we have some minor differences in the MIME-Version etc. - but the most interesting thing seems to be X-SFDC-EmailCategory where we have emailAuthorEmail in Classic vs. apiSingleMail in Lightning. The first option kind of sounds like an email that is "authored" by the user as it was set up in their email settings (see above).
Maybe the difference is always there? Maybe the problem only becomes apparent when the user has set up their email settings with an org-wide email address? Maybe there's an option that I missed? I don't know. Did anybody else notice the same? Is this a bug or a feature?
