Q. I’ve gotten married and changed my name, but my email address includes my maiden name. Do I have to open an entirely new email account to fix that?

A. Not necessarily—and even then, that doesn’t have to come at the cost of abandoning your old address overnight.

The job is easiest at Microsoft’s Outlook.com, where you can create a new “alias” for your account that has a new e-mail address but keeps all your messages and contacts in the same place. Sign into your Outlook.com webmail, click the gear icon at the top right, choose “Connected Accounts,” and then scroll down to “Manage or choose a primary alias.”

On that page, create a new Outlook.com address, then click the “Make primary” link to have that become your ongoing identity on Microsoft’s service.

Yahoo Mail offers its own alias feature. To create a new address linked to your existing account, log into Yahoo’s webmail page, click the gear icon at the top right, click “Settings,” click “Accounts,” click your Yahoo account and scroll down to “Extra email address.” You can then make that new address your default under the “Writing email” settings category.

(Disclosure: I write for Yahoo’s Yahoo Finance news site, but I have zero input into the workings of the company’s email service.)

Things are much more of a mess at Google’s Gmail if you don’t have a new e-mail address at another mail service, which you can set as your alias there. Otherwise, you have to create a new Google account, then set your old Gmail account to forward messages to the new one.

To configure Gmail to do that, log into Gmail on the web, click the gear icon at the top right, choose “Settings,” and click the “Forwarding and POP/IMAP” tab. You can then instruct Google to send…