Here's my code in imports/api/friends/methods.js:
import {Meteor} from "meteor/meteor";
import {Accounts} from "meteor/accounts-base";
if (Meteor.isServer) {
Accounts.emailTemplates.siteName = "....";
Accounts.emailTemplates.from = "example01 <[email protected]>";
Accounts.emailTemplates.verifyEmail.from = function () {
return "example01 <[email protected]>";
};
Accounts.emailTemplates.verifyEmail.text = function(user, url) {
return '<h1>Thank you for your registration.</h1><br/><a href="' + url + '">Verify eMail</a>';
};
}
And this is the result:
As you can see, the format is ingnored by Gmail. We can se the HTML tags <h1> and <br>.
Why are they not display as HTML?

You used the wrong function. If you use
Accounts.emailTemplates.verifyEmail.text, the body will be returned as text and not as HTML. So instead, you should useAccounts.emailTemplates.verifyEmail.html.For example:
Read more about
Accounts.emailTemplates.