Pitfalls 

Wrong Entry Point 

This extension needs an entry point with a protokoll and domain to proper fetch internal pages.

An entry point with just a slash ("/") will not work!

This value can be set here "Sites Module" > "Edit site" > "General" > "Entry Point".

If you e.g. use the introduction package, this value is set to "/" by default!

Self Signed Certificates 

If you use a self signed certificate, you should also check, that "HTTP" > "verify" is set to "0".

This can be done under "Admin Tools" > "Settings" > "Configure Installation Wide Options" > Filter by "verify" > enter "0" > Press "Write configuration"

The same setting can be done by adding this to the (additional) settings.php:

$GLOBALS['TYPO3_CONF_VARS']['HTTP'][GuzzleHttp\RequestOptions::VERIFY] = false;
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Embedding Images & Basic Auth 

If your system is protected by basic auth (e.g. because it's a staging system) you can set HTTP username and password in the mail wizard settings.

This will add the Guzzle "auth" option to the MailerUtility::fetchContentFromUrl method, which enables MAIL to fetch the html code for the mail wizard preview.

If you also activate image embedding, the basic auth credentials has to be add at a second place to enable the MAIL Service, which runs in a different context (CLI), to fetch the images as well.

To do so, add this to the (additional) settings.php of the Basic Auth Protected system (e.g. staging):

$GLOBALS['TYPO3_CONF_VARS']['HTTP'][GuzzleHttp\RequestOptions::AUTH] = ['username', 'password'];
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Jumpurl Error Messages 

The current version of jumpurl found in ter (8.0.3) has some php 8 issues:

There is already a pending pull request, which unfortunately stuck in that state since a while:

To help your self out, you could download the zip of the pull request repo, which contains the necessary fixes under this url:

After downloading, rename the master.zip to jumpurl_8.0.3.zip and upload it within the extension manager.