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We sent a mass mailing under 5.27.0 (Wordpress) and the email Click Through links were invalid as noted earlier. They did however include our domain.
We upgraded to 5.27.3 and the links are still invalid. They appear to be missing our domain, e.g.
http://?civiwp=CiviCRM&q=civicrm/mailing/url&u=674&qid=63201
I've not seen this myself (domain missing) but the base page is missing as well from your link.
I'd review the following:
make sure that the base page is set - go to https://example.org/wp-admin/admin.php?page=CiviCRM&q=civicrm%2Fadmin%2Fsetting%2Fuf&reset=1
Review the Base Page setting and value, it cannot be blank
Make sure there is a published page that matches the one in that page
If there is no value there, add one, civicrm is the default and then create a WP page with that slug
Make sure the page is public and visiuble to all
Once you've done that (or confirmed the base page exists) Visit this page https://example.org/wp-admin/options-permalink.php
Confirm that your permalinkls are set to anything EXCEPT Plain
If it is set to Plain change to one of the other options and save
If it is not set to plain, you can exit the page
Flush CiviCRM Caches go to https://example.org/wp-admin/admin.php?page=CiviCRM&q=civicrm%2Fadmin%2Fsetting%2FupdateConfigBackend&reset=1 and click cleanup caches
After all that is complete, visit a contribution or event page and be sure it displays. I'd then try a test email.
