Home mailbox full. How do I fix?

...then you are using IMAP protocol, and all your email Master Copies are on your email service's server on the Internet.

use a web Browser, surf to your webmail portal and log in.

Sort your inbox by SIZE. I find that attachments are far larger than the written words, and getting rid of a handful of large items can get you quickly down to a reasonable sized inbox.

Check your inbox in the web mail account.

That inbox may be full; your email service may limit the number of emails you let accumulate.

Open a web Browser,

enter gmail in the search bar

a google web page opens, select webmail

enter your complete email address

when prompted, enter your mail password and log in.

Proceed to WebMail.

use the selection controls to select BIG emails, such as larger than 1 GB

if any are found, decide whether your Really need to keep them.

keep reducing the size until you have dealt with enough of the largest and your free space in adequate again.

In general, Is it your POLICY to read you emails:

• ONLY on your Mac, and NEVER access them from any other devices, ever?

-OR-

• do you access your emails from BOTH your Mac and your iPhone, for example?

the answer determines what email protocol is in use, and how and where to apply de-cluttering.

https://www.xfinity.com/support/articles/sign-in-to-email-or-voicemail-on-xfinity?view=app&epik=dj0yJnU9dzBlUmlTa3prQ3hQdDBoenF5dmhiNXlTS2FrMEhONmkmcD0wJm49cEQ5QUZYRnRGcFJ3bmZEN0lidnRodyZ0PUFBQUFBR0FUa1c4

do you get emails on ONE device only?

or on your Mac AND on your phone as well?

How can you sort by size if Mail won't open? Says not enough space in home folder.

mac and phone

what email provider?

comcast