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I just upgraded to Sendy 4.0 hoping that I could use emojis in the subject line, just like the email you sent announcing the new release. Unfortunately, it turns into question marks.
Is there any chance you can add that ability soon? I even looked into the headers of your email and it seems to have been sent with Sendy...
Sendy already have emoji support since version 2 → https://sendy.co/get-updated#208. The 4.0 newsletter you received is sent from Sendy.
You'd need to set the $charset in your /includes/config.php to 'utf8mb4'.
There is also an existing thread discussing this → https://sendy.co/forum/discussion/11479/emoji-support-in-subject/p1