Hi @senjoralfonso,
Apologies for the slow turnaround here!
We use Solid Mail on most of our test environments to send the website emails, and so far, we have not encountered a case where email contents transformed into that character instead of readable text.
Seeing the ? character could indicate a mismatch between how the data is stored, processed, or sent. Can you please check if your site’s database and WordPress configuration are set to UTF-8 encoding?
To check the DB encoding, I’d suggest reaching out to your host, but if you’re familiar with using tools like phpMyAdmin, run the query here to display the values.
To check the WP configuration, open your site’s wp-config.php file and check if these lines exist:
define('DB_CHARSET', 'utf8');
define('DB_COLLATE', '');
Does the problem disappear if you comment out those lines?
Does your email content contain special characters/symbols in them during submission? What form are you using?
Does the issue happen when generic WP emails (ex. registered user) are sent out?
Please share steps on how we can reproduce this issue on our test sites, so we can investigate further.
Let us know what you can find!